According to an AP report:
The news groups filing the brief also included [in addition to the NY Times and the AP,] Courtroom Television Network, Dow Jones & Co., Gannett Co. Inc., The Hearst Corp., Incisive Media, National Public Radio, NBC Universal Inc., Radio-Television News Directors Association, The Reporters Committee for Freedom of the Press, The E.W. Scripps Co., Tribune Co., and Washington Post Digital.The biggies' brief, drafted by Levine Sullivan Koch & Schulz, LLP, is the second amicus I'm aware of filed in the case. Earlier today, EFF, several other organizations, and yours truly signed onto a separate amicus brief. I am unaware of any anti-webcast amici.