This is a bit late, but here is the list of new releases to Xbox Live Video Marketplace. We already knew about '300', but there really isn't to many gems in there. Thanks again to The Major.

TV
The Comedy Central Roast of Flavor Flav
The History Channel Presents The Last Stand of the 300 The Battle of Thermopylae

Movies
300 (HD)
Aqua Teen Hunger Force Colon Movie Film For Theaters (HD)
Haunted Boat HD
Surf School HD
And Then Came Love
Traci Townsend
Rock the Bells
Street Stars: Game Over
Street Stars: Alpo