Working (depends on your definition):
Warthog Launch - only shows the MC juggling a grenade
Xiao Movie - things only have the loading screen and some music
Family Guy - short clips work but no sound (its mp3 encoded)
Madness Combat - no sound, loooong load time.
Strong Bad Email 57(Japanese Cartoon) - no sound
Magical Trevor - no sound
Not Working (also depends on your definition):
The Hair Game on Homestarrunner
Population Tire (Homestarr Runner)
Spank the Monkey
Please submit what you've found!