Using Google Chrome for GTV with Custom user agent copied from Chrome for Windows 7
Fox - asks for Flash to be installed
Comedy Central - Works
Hulu - Originally it would work for a while then sound would drop out after about 20 seconds. Continued to do this after at least 2 reboots. A day later and another reboot later works but will often begin to stutter during commercials when full screen.
ABC - Large black box over video - audio works fine. Video visible during scroll. If you wait until after the commercial and click at the bottom right hand corner where the full screen selection would be I got clear full video. (sometimes it a takes a few tries to find it)
CBS - Works
NBC - Cycles like it wants to load the video then nothing...
A&E - Works
National Geographic - Works
SYFY - Originally worked as it was one of the first ones I tested after rooting. A day later attempting to load a video crashed the browser. After reopening nothing. No error, but no video.
CW - Works
Cartoon Network - Works
Nickelodeon - Works
--Feel free to add your experiences to the list.