FORM 424B7

Filed Pursuant to Rule 424(b)(3) and 424(b)(7)

File No. 333-131373

PROSPECTUS SUPPLEMENT NO. 15

(To Prospectus dated January 30, 2006, as supplemented by Prospectus Supplement No. 1 dated May 16, 2006, by Prospectus Supplement No. 2 dated May 19, 2006, by Prospectus Supplement No. 3 dated May 26, 2006, by Prospectus Supplement No. 4 dated June 2, 2006, by Prospectus Supplement No. 5 dated June 9, 2006, by Prospectus Supplement No. 6 dated June 16, 2006, by Prospectus Supplement No. 7 dated June 23, 2006, by Prospectus Supplement No. 8 dated June 30, 2006, by Prospectus Supplement No. 9 dated July 7, 2006, by Prospectus Supplement No. 10 dated July 14, 2006, by Prospectus Supplement No. 11 dated July 21, 2006, by Prospectus Supplement No. 12 dated August 4, 2006, by Prospectus Supplement No. 13 dated August 25, 2006 and by Prospectus Supplement No. 14 dated September 8, 2006)

13,525,195 Shares

LOGO

Common Stock

 


The following information supplements information contained in the prospectus dated January 30, 2006, as supplemented by prospectus supplement No. 1 dated May 16, 2006, by prospectus supplement No. 2 dated May 19, 2006, by prospectus supplement No. 3 dated May 26, 2006, by prospectus supplement No. 4 dated June 2, 2006, by prospectus supplement No. 5 dated June 9, 2006, by prospectus supplement No. 6 dated June 16, 2006, by prospectus supplement No. 7 dated June 23, 2006, by prospectus supplement No. 8 dated June 30, 2006, by prospectus supplement No. 9 dated July 7, 2006, by prospectus supplement No. 10 dated July 14, 2006, by prospectus supplement No. 11 dated July 21, 2006, by prospectus supplement No. 12 dated August 4, 2006, by prospectus supplement No. 13 dated August 25, 2006 and by prospectus supplement No. 14 dated September 8, 2006 (together, the “Prospectus”), relating to the resale by selling stockholders, including their respective transferors, donees, pledgees or successors in interest, of our common stock issued or issuable upon the exercise of warrants that were sold to those investors identified in this prospectus supplement in 2000 and 2001 private placements of our common stock and warrants to purchase our common stock. This prospectus supplement should be read in conjunction with the Prospectus, and is qualified by reference to the Prospectus, except to the extent that the information presented herein supersedes the information contained in the Prospectus. This prospectus supplement is not complete without, and may not be delivered or utilized except in connection with, the Prospectus, including any amendments or supplements thereto.

The shares of our common stock are quoted on The Nasdaq Global Select Market under the symbol “NDAQ.”

Investing in our common stock involves risks that are described in the “Risk Factors” section of our Annual Report on Form 10-K and our Quarterly Reports on Form 10-Q that are incorporated by reference in this prospectus supplement.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense.

 


The date of this prospectus supplement is September 20, 2006.


SELLING STOCKHOLDERS

The following table supplements the table of selling stockholders and related footnotes appearing under the heading “Selling Stockholders” of the prospectus dated January 30, 2006, as supplemented by prospectus supplement No. 1 dated May 16, 2006, by prospectus supplement No. 2 dated May 19, 2006, by prospectus supplement No. 3 dated May 26, 2006, by prospectus supplement No. 4 dated June 2, 2006, by prospectus supplement No. 5 dated June 9, 2006, by prospectus supplement No. 6 dated June 16, 2006, by prospectus supplement No. 7 dated June 23, 2006, by prospectus supplement No. 8 dated June 30, 2006, by prospectus supplement No. 9 dated July 7, 2006, by prospectus supplement No. 10 dated July 14, 2006, by prospectus supplement No. 11 dated July 21, 2006, by prospectus supplement No. 12 dated August 4, 2006, by prospectus supplement No. 13 dated August 25, 2006 and by prospectus supplement No. 14 dated September 8, 2006 by adding or supplementing the information below with respect to selling stockholders. When we refer to the “selling stockholders” in this prospectus supplement, we mean those persons listed in the table below, as well as the pledgees, donees, assignees, transferees, successors and others who hold any of the selling stockholders’ interest. The shares of our common stock offered by this prospectus supplement include the shares of our common stock issued or issuable upon the exercise of warrants that were sold to those investors identified in this prospectus in our 2000 and 2001 private placements of our common stock and warrants to purchase our common stock.

Information regarding the selling stockholders may change from time to time and any changed information will be set forth in supplements to this prospectus supplement if and when necessary. Unless set forth below, to our knowledge, none of the selling stockholders has, or within the past three years has had, any material relationship with us or any of our predecessors or affiliates.

A selling stockholder may from time to time offer and sell any or all of its securities under this prospectus supplement. Because a selling stockholder is not obligated to sell the shares of our common stock held by it, we cannot estimate the number of shares of our common stock that a selling stockholder will beneficially own after this offering.

 

Name of Selling Stockholder

   Shares Beneficially
Owned Prior to
this Offering
  

Number of
Shares that may
be sold

by this Prospectus
Supplement

   Percentage of Shares
Beneficially Owned
After Offering(1)

Instinet, LLC (2)

   1,430,550    281,250    *

Lehman Brothers Inc.

   1,125,000    1,125,000    *

Credit Suisse Securities (USA) LLC (3)

   1,101,475    375,000    *

Goldman, Sachs & Co.

   1,063,700    1,063,700    *

Goldman Sachs Execution & Clearing

   875,000    875,000    *

Morgan Stanley and Co., Incorporated

   777,500    777,500    *

Merrill Lynch International (4)

   661,000    661,000    *

JP Morgan Securities Inc. (5)

   600,699    435,550    *

ML IBK Positions, Inc. (6)

   473,750    468,750    *

Oracle Corporation

   441,500    430,000    *

Cisco Systems, Inc.

   430,000    430,000    *

Deutsche Bank Securities

   411,300    411,300    *

UBS Financial Services Inc. (7)

   375,600    375,600    *

CIBC World Markets Corp.

   360,526    93,326    *

Verizon Investments, Inc.

   340,000    340,000    *

Banc of America Securities LLC (8)

   337,500    337,500    *

Citidel Equity Fund, Ltd.

   318,904    300    *

AIGTI, Inc.

   296,243    296,243    *

Salomon Smith Barney Inc.

   285,725    285,725    *

Charles Schwab and Co., Inc. (9)

   281,250    281,250    *

Bernard L. Madoff Investment Securities LLC

   250,000    250,000    *

William R. Hough

   238,474    210,526    *

Amazon.com NV Investment

   215,000    215,000    *

Intel Corporation (10)

   215,000    215,000    *

Microsoft Corporation

   215,000    215,000    *

Sun Microsystems, Inc.

   215,000    215,000    *

RBC Dain Rauscher

   189,625    37,125    *

Bear Stearns & Co. Inc. (11)

   187,500    187,500    *

Ulticom, Inc.

   147,000    50,000    *

Sunrise Partners Limited

   125,000    125,000    *

AIG Financial Securities Corporation

   120,600    120,600    *

Converging Arrows Inc.

   120,600    120,600    *

DE Shaw Valence LLC

   107,000    6,000    *

Harris Nesbitt Corp.

   103,000    3,000    *

Comverse Technology, Inc.

   96,225    50,000    *

Keefe, Bruyette & Woods, Inc. (12)

   94,019    300    *

TD Ameritrade Online Holding Corp.

   71,200    24,700    *

State Street Corp

   70,000    20,000    *

The Krieger Family Limited Partnership

   58,000    50,000    *

BlackRock Investments, Inc.

   47,211    47,211    *

Sandler O’Neill & Partners, LP (13)

   46,500    14,125    *

Coastal Capital Markets, LLC

   44,200    44,200    *

Check Point Software Technologies Ltd.

   35,000    35,000    *

Amaranth LLC

   28,400    600    *

Piper Jaffrey Foundation Corpus

   28,288    28,288    *

SWS Group, Inc.

   26,700    2,100    *

Craig A. Smith

   26,000    23,000    *

On-Line Investment Services Inc.

   22,140    22,140    *

Guzman & Company

   20,600    20,600    *

Hayden R Fleming & LaDonna M. Fleming Revocable Trust

   20,000    10,000    *

Wien & Malkin Securities Corp.

   19,440    19,440    *

McCarthy & Co.

   19,300    19,300    *

Regal Discount Securities, Inc.

   19,000    13,000    *

Mount Pleasant Brokerage Services

   18,829    18,829    *

AUDOBON SECURITIES INC

   18,300    18,300    *

Highbridge Capital Corporation

   18,000    18,000    *

T. Rowe Price

   18,000    18,000    *

Schonfeld Securities, LLC

   17,900    17,900    *

Valley National Holdings LLC

   16,154    16,154    *

JA Glynn & Co.

   14,600    2,400    *

ABN AMRO Incorporated

   13,750    2,750    *

Lipper Analytical Securities Corporation

   13,600    10,600    *

GFI Securities LLC

   12,400    2,400    *

Paulson Investment Company

   12,400    2,400    *

Scott & Stringfellow, Inc.

   11,875    2,375    *

Great Pacific Fixed Income Securities, Inc.

   11,460    7,460    *

The Dreyfus Service Corporation

   11,210    1,200    *

First Analysis Securities Corporation

   11,200    1,000    *

Koonce Securities, Inc.

   11,151    4,600    *

Warren D. Nadel & Company

   11,000    9,000    *

Driehaus Securities Corporation

   11,000    3,000    *

Hunter Associates, inc.

   10,400    4,800    *

Susquehanna Capital Group

   10,400    2,400    *

Senvest International LLC

   10,300    10,300    *

Trans American Equities Corporation

   10,300    5,000    *

United Equities Company

   10,300    2,500    *

Muriel Siebert & Co., Inc.

   10,200    1,200    *

Automated Trading Desk

   10,129    10,129    *

WestLB Securities, Inc.

   9,510    1,500    *

MHA Financial Corp.

   9,500    3,000    *

Parnassus Investments

   9,500    1,500    *

Mid-Ohio Securities Corp

   9,400    2,400    *

B. Riley & Co., Inc.

   9,300    9,300    *

Garban Corporates LLC

   9,200    1,200    *

Delta Equity Services Corporation

   9,000    9,000    *

B-Trade Services LLC

   9,000    3,000    *

Dupasquier & Co., Inc.

   9,000    3,000    *

Allen & Company, Incorporated

   8,800    2,200    *

SWS Financial Services

   8,800    300    *

Valdes & Moreno, Inc.

   8,600    8,600    *

First State Securities, Inc.

   8,500    4,500    *

Angelo, Gordon & Co. LP

   8,500    1,500    *

Franklin Templeton

   8,500    1,500    *

Middlegate Securities Ltd.

   8,500    1,500    *

MML Investors Services Inc.

   8,500    1,500    *

OppenheimerFunds Distributor, Inc.

   8,500    1,500    *

Templeton/Franklin Investment Services, Inc.

   8,500    1,500    *

Ramius Securities, LLC

   8,500    1,200    *

Lawrence B. Lappin

   8,300    1,500    *

Rothschild Inc.

   8,210    1,200    *

SANTANDER INVESTMENT

   8,100    900    *

Comprehensive Capital Corp.

   8,000    8,000    *

American Securities Team, Inc.

   8,000    6,000    *

Salman Partners (USA) Inc.

   8,000    6,000    *

Larry E. Peters

   8,000    3,000    *

Marc J. Lane & Company

   8,000    3,000    *

McKinnon & Company, Inc.

   8,000    3,000    *

William Blair & Company, LLC

   7,988    7,988    *

TransMarket Group LLC

   7,800    300    *

Interactive Brokers, LLC

   7,700    2,400    *

Timber Hill LLC

   7,700    1,200    *

Hazlett, Burt & Watson, Inc.

   7,700    1,200    *

John G Kinnard & Co., Inc.

   7,625    2,375    *

R J Steichen & Company

   7,625    2,250    *

Dematteo Monness, Inc.

   7,500    1,500    *

Garban LLC

   7,500    1,500    *

Archipelago LLC

   7,500    1,200    *

Newman and Associates, Inc.

   7,500    1,200    *

Aufhauser Securities, Inc.

   7,400    2,900    *

Arrol Securities Incorporated

   7,250    4,250    *

BNP Paribas Securities Corp.

   7,200    1,200    *

Frank Baiata

   7,000    4,500    *

Cadaret, Grant & Co., Inc.

   7,000    3,000    *

MichaelAngelo LP

   7,000    3,000    *

Delaware Charter Gty Trust TR

   6,820    4,860    *

P. Schoenfeld Asset Management LLC

   6,700    2,400    *

Thomas A. Harenburg

   6,600    6,600    *

JLM Securities Company

   6,600    6,300    *

CFS Securities, Inc.

   6,600    4,800    *

Phillips & Company Securities Inc.

   6,500    1,800    *

Davenport & Company LLC

   6,500    1,500    *

FNB Brokerage Services Inc.

   6,500    1,500    *

Garban Capital Markets LLC

   6,500    1,500    *

MML Distributors, LLC

   6,500    1,500    *

Garban Securities LLC

   6,500    1,200    *

Grigsby & Associates, Inc.

   6,500    1,200    *

Belfinance Securities, Inc.

   6,383    4,383    *

KLA-Tencor Corporation

   6,300    3,150    *

Merchant Capital, LLC

   6,000    6,000    *

Ark Investments

   6,000    4,600    *

C & L Securities Corporation

   6,000    3,000    *

First Brokerage America, LLC

   6,000    3,000    *

Falcon Securities, Inc.

   5,900    3,600    *

Johnson Securities, Inc.

   5,700    2,200    *

Citrix Systems, Inc.

   5,650    1,883    *

Jeremy C. Huang

   5,600    3,600    *

WR Rice Financial Services, Inc.

   5,538    3,000    *

Merrill Lynch Financial Markets Inc. (4)

   5,500    5,500    *

Brahman Securities, Inc.

   5,500    5,500    *

Edward Ronald Lara

   5,500    2,400    *

Banyan Securities, LLC

   5,500    1,500    *

TIP Partners

   5,500    1,500    *

BNY Investment Center Inc.

   5,400    2,400    *

Calamos Financial Services, Inc.

   5,300    300    *

First Albany Corporation

   5,100    5,100    *

Goldman, Lass Securities

   5,000    5,000    *

Strome Securities, LP

   5,000    5,000    *

John C. Helmer & Mary D. Helmer

   5,000    4,000    *

MB Financial Services, Inc.

   5,000    4,000    *

Commerce Securities Corporation

   5,000    3,000    *

Golden Financial Services, Inc.

   5,000    3,000    *

Greenberg Financial Group

   5,000    3,000    *

Joseph Kosinsky, Inc.

   5,000    3,000    *

Shukla Financial Services, Inc.

   5,000    3,000    *

Wayne Edgar Reis

   5,000    3,000    *

3030 Securities Inc.

   5,000    3,000    *

Southwest Asset Management, Inc.

   5,000    3,000    *

Atmel Corporation

   5,000    1,667    *

Biomet, Inc.

   5,000    1,667    *

Arthurs, Lestrange, & Company, Inc.

   4,900    2,400    *

Diversified Resources

   4,800    3,800    *

Banca IMI Securities Corp.

   4,800    3,600    *

DFS Equities

   4,700    2,400    *

Prospera Financial Services, Inc.

   4,600    4,600    *

Resource Securities Corp.

   4,600    2,600    *

Ewing Capital, Inc.

   4,600    300    *

Abacus, Inc.

   4,573    4,242    *

DM Kelly & Company

   4,500    4,500    *

E*Trade Clearing LLC

   4,500    4,500    *

Great Nation Investment Corp.

   4,500    4,500    *

Mike Discount Securities Inc.

   4,500    4,500    *

O’Keefe, Shaw & Co Incorporated

   4,500    4,500    *

SCF Securities, Inc.

   4,500    4,500    *

Conifer Securities, LLC

   4,500    3,000    *

Adams, Harkness & Hill Inc.

   4,500    1,500    *

AgriCapital Securities Inc.

   4,500    1,500    *

Brownstone Investment Group, LLC

   4,500    1,500    *

Financorp Group International

   4,500    1,500    *

Hamilton Cavanaugh Investment

   4,500    1,500    *

Manarin Securities, Corp.

   4,500    1,500    *

LJ Goldstein and Co., Inc.

   4,400    1,200    *

Auto Club Funds, Inc.

   4,200    1,200    *

Calvert Distributors Inc.

   4,200    1,200    *

Spencer Trask Securities

   4,100    4,100    *

Monness, Crespi, Hardt & Co., Inc.

   4,010    2,000    *

Alliance Affiliated Equities Corp.

   4,000    4,000    *

Gilder Gagnon Howe & Co., LLC

   4,000    4,000    *

ATS, LP

   4,000    3,000    *

Mellin Securities, Inc.

   4,000    3,000    *

Sentinel Brokers Company

   4,000    3,000    *

Shearman Ralston Inc.

   4,000    3,000    *

Wall Street Discounts, Inc.

   4,000    3,000    *

Holland Capital Management, LP

   4,000    2,000    *

Bernard Herold & Co., Inc.

   4,000    600    *

Lieblong & Associates

   3,872    3,572    *

Harvey Jon Crosby

   3,750    2,250    *

Buerk Dale Victor LLC

   3,700    2,700    *

Fox, Reusch & Co., Inc.

   3,700    1,200    *

Senate Securities

   3,650    1,350    *

BNY Clearing Services, Inc.

   3,600    3,600    *

First London Securities Corp.

   3,600    3,600    *

Inter-Market Capital Corporation

   3,600    3,600    *

PCI Trade Securities

   3,600    3,600    *

Carthage Group, Inc.

   3,600    600    *

Esico, Co.

   3,600    600    *

C E Unterberg, Towbin

   3,550    3,550    *

Lingg & Co.

   3,533    3,533    *

Strouse Greenberg Realty

   3,510    1,500    *

Intellisync Corporation

   3,500    3,500    *

First Securities Northwest, Inc.

   3,500    1,500    *

HADC Equities, Inc.

   3,500    1,500    *

Martin Greenberg

   3,500    1,500    *

PR Gilboy & Associates Inc.

   3,500    1,500    *

Cambridge Group Investments Ltd.

   3,500    1,200    *

Fagenson & Company Inc.

   3,500    1,200    *

Genesis Day Trade, LLC

   3,500    1,200    *

Kurt Salmon Associates Capital Advisors Inc.

   3,500    1,200    *

New Harbor Capital, Inc.

   3,500    1,200    *

Potomac Investment Company

   3,500    600    *

Fremont Capital Inc.

   3,400    2,400    *

Monument Group, Inc.

   3,400    2,400    *

Network 1 Financial

   3,400    900    *

Pellinore Securities Corp.

   3,300    3,300    *

RGR Financial Corp

   3,300    3,300    *

Mary N. Odom

   3,300    3,000    *

Riordan, Johnston, & Javadizadeh, Inc.

   3,300    3,000    *

Benefit Finance Securities LLC

   3,300    300    *

Europa Securities, LLC

   3,210    1,200    *

Haywood (USA) Securities Inc.

   3,210    1,200    *

Feltl and Company

   3,200    1,200    *

Track Data Securities Corp.

   3,200    1,200    *

Triangle Securities LLC

   3,200    1,200    *

Stifel, Nicolaus & Company, Incorporated

   3,125    3,125    *

Carbon Capital Securities LLC

   3,040    3,000    *

AGF Securities, Inc

   3,000    3,000    *

AIG Trading Group, Inc.

   3,000    3,000    *

Arbor Research & Trading Inc.

   3,000    3,000    *

Aurora Consulting, Inc.

   3,000    3,000    *

Braver, Stern Securities Corp.

   3,000    3,000    *

Bryan Gill

   3,000    3,000    *

Capital Brokerage Corporation

   3,000    3,000    *

Capital Preservation Partners LLC

   3,000    3,000    *

Chilian Partners, LP

   3,000    3,000    *

Clark Nobil & Co.

   3,000    3,000    *

DE Shaw Investments LP

   3,000    3,000    *

DeSpain Financial Corporation

   3,000    3,000    *

Doft & Co., Inc.

   3,000    3,000    *

Domestic Securities, Inc.

   3,000    3,000    *

ED&F Man International Inc.

   3,000    3,000    *

FINANCIAL SCIENCES INC

   3,000    3,000    *

First Liberties Financial

   3,000    3,000    *

FMN Capital Corporation

   3,000    3,000    *

Frank Elshaug

   3,000    3,000    *

Frederick J. Wertlieb

   3,000    3,000    *

Gabelli & Company, Inc.

   3,000    3,000    *

Gabelli Fixed Income Distributors, Inc.

   3,000    3,000    *

GE Investment Distributors, Inc.

   3,000    3,000    *

Gill & Associates, Inc.

   3,000    3,000    *

GNA Distributors, Inc.

   3,000    3,000    *

Graybill Investments

   3,000    3,000    *

Hollencrest Securities, LLC

   3,000    3,000    *

IBS Securities, LLC

   3,000    3,000    *

ICBA Securities

   3,000    3,000    *

Invemed Associates, LLC

   3,000    3,000    *

Investor Service Center, Inc.

   3,000    3,000    *

Irving Lederman

   3,000    3,000    *

J. Roe Burton & Co. Inc.

   3,000    3,000    *

JJR Associates, Inc.

   3,000    3,000    *

JMP Securities LLC

   3,000    3,000    *

Kayser & Company

   3,000    3,000    *

Landolt Securities, Inc.

   3,000    3,000    *

LCM Marketing Corp.

   3,000    3,000    *

Mac-Per-Wolf Company

   3,000    3,000    *

MacAllaster Pitfield MacKay Inc.

   3,000    3,000    *

Metropolitan Life Insurance Company

   3,000    3,000    *

Midtown Holdings LLC

   3,000    3,000    *

Miller Tabak + Co., LLC

   3,000    3,000    *

MSBN, Inc.

   3,000    3,000    *

Murray Zucker

   3,000    3,000    *

Nationwide Planning Associates Inc.

   3,000    3,000    *

Newby & Company

   3,000    3,000    *

O’Toole Insurance & Securities

   3,000    3,000    *

Omega Securities, Inc.

   3,000    3,000    *

Osprey Partners LLC

   3,000    3,000    *

Paulsen Securities Inc

   3,000    3,000    *

Peters Securities CO LP

   3,000    3,000    *

Questrion Research Corporation

   3,000    3,000    *

Research Capital USA Inc

   3,000    3,000    *

Ryan Beck & Co, Inc.

   3,000    3,000    *

Searle & Co.

   3,000    3,000    *

TM Capital Corp.

   3,000    3,000    *

Trio Securities Inc.

   3,000    3,000    *

Vining-Sparks IBG, Limited Partnership

   3,000    3,000    *

Waters, Parkerson & Co., Inc.

   3,000    3,000    *

World Trend Investments, Ltd

   3,000    3,000    *

Wukasch Capital Corporation

   3,000    3,000    *

M & T Bank Corporation

   3,000    3,000    *

World Market Equities, Inc.

   3,000    2,400    *

Redwine & Company, Inc.

   3,000    2,000    *

Hagerty Stewart & Associates Inc.

   3,000    1,500    *

Leighton McGill Partners

   3,000    1,500    *

Stuart Portfolio Consultants LP

   3,000    1,500    *

BNY Capital Markets, Inc.

   3,000    1,500    *

R. Scott Nieboer

   3,000    1,500    *

American Investors Company

   3,000    300    *

Other Stockholders

   818,832    562,876    *

Certain other beneficial owners of common stock or future transferees, pledgees, donees of or from any such holder, if identified as described below (14)(15)(16)

   352,378    352,378    *

Total

   17,862,944    13,525,195    *

* Less than 1%.

(1) Calculated based on Rule 13d-3(d)(1)(i) of the Securities Exchange Act of 1934, as amended (Exchange Act), using 111,900,966 shares of common stock outstanding (including shares of restricted common stock entitled to vote at the annual meeting) as of May 3, 2006.

(2) Silver Lake Partners owns approximately 88% of the parent of Instinet, LLC. Glenn Hutchins, a principal of Silver Lake Partners, is a member of our Board of Directors.

(3) An affiliate of Credit Suisse Securities (USA) LLC has engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us, including as a financial advisor or financing source.

(4) One of our directors, Jeffrey N. Edwards, is an employee of an affiliate of Merrill Lynch International. Merrill Lynch International has engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us, including as a financial advisor or financing source.

        (5) JP Morgan Securities Inc. has engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us, including as a financial advisor or financing source.

(6) One of our directors, Jeffrey N. Edwards, is an employee of an affiliate of ML IBK Positions, Inc.

(7) An affiliate of UBS Financial Services Inc. has engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us, including as a financial advisor or financing source.

(8) Banc of America Securities, LLC has engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us, including as a financial advisor or financing service.

(9) One of our directors, Lon Gorman, was an executive officer of The Charles Schwab Corporation and Schwab Capital Markets, affiliates of Charles Schwab & Co., Inc. until November 2004.

(10) One of our directors, Arvind Sodhani, is an officer of Intel Corporation.

(11) Bear, Stearns & Co. Inc. has engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us, including as a financial advisor or financing source.

(12) Keefe, Bruyette & Woods, Inc. has engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us, including as a financial advisor or financing source.

(13) One of our directors, Thomas O’Neill, is a founding principal of Sandler O’Neill Partners, L.P. Sandler O’Neill Partners, L.P. has engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us, including as a financial advisor or financing source.

(14) Selling stockholders may be identified in the table above by us at a later date by filing a prospectus supplement to this prospectus supplement. Such other holders shall not be permitted to sell pursuant to the registration statement unless and until they are listed in the selling stockholders table in a supplement to this prospectus supplement.

(15) Assumes that any selling stockholders or any future pledgees, donees, assignees, transferees or successors of or from such other holders of the shares do not beneficially own any shares of common stock other than the common stock registered hereby.

(16) Includes 255,285 shares of our common stock represented by warrants originally available for exercise that expired on June 27, 2006 and that were subsequently sold by NASD on July 10, 2006.

 

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