Exhibit 24.1

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Ralph Quinsey and Steven Buhaly, jointly and severally, his attorneys-in-fact, each with the power of substitution, for him in any and all capacities, to sign any amendments to this Annual Report on Form 10-K and
to file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact, or his substitute or substitutes, may do or
cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been
signed by the following persons in the capacities and on the dates indicated.



|                                              |  |                                                                      |  |               
|--------------------------------------------- |  | -------------------------------------------------------------------- |  | --------------
|Signature                                     |  | Title                                                                |  | Date          
|                                              |  |                                                                     
|/s/ RALPH G. QUINSEY Ralph G. Quinsey         |  | President and Chief Executive Officer (Principal Executive Officer)  |  | March 11, 2008
|                                              |  |                                                                     
|/s/ STEVEN J. BUHALY Steven J. Buhaly         |  | Chief Financial Officer (Principal Financial and Accounting Officer) |  | March 11, 2008
|                                              |  |                                                                     
|/s/ STEVEN J. SHARP Steven J. Sharp           |  | Chairman of the Board                                                |  | March 11, 2008
|                                              |  |                                                                     
|/s/ PAUL A. GARY Paul A. Gary                 |  | Director                                                             |  | March 11, 2008
|                                              |  |                                                                     
|/s/ CHARLES SCOTT GIBSON Charles Scott Gibson |  | Director                                                             |  | March 11, 2008
|                                              |  |                                                                     
|/s/ NICOLAS KAUSER Nicolas Kauser             |  | Director                                                             |  | March 11, 2008
|                                              |  |                                                                     
|/s/ WALDEN C. RHINES Walden C. Rhines         |  | Director                                                             |  | March 11, 2008
|                                              |  |                                                                     
|/s/ WILLIS C. YOUNG Willis C. Young           |  | Director                                                             |  | March 11, 2008