I shall start then!
Best Graphics - Bioshock
Best Sound Effects - Bioshock
Best Replay Value - Call of Duty 4
Best Music/Soundtrack - Halo 3
Best Story - Bioshock
Most Innovative Feature in a Game: Portal Gun
Most Innovative Game: Portal
In specific catagories:
Best First/Third Person Shooter: Call of Duty 4
Best Racing Game: Project Gotham Racing 4
Best RPG: Mass Effect
Best Action/Adventure Game: Assassin's Creed
Best XBLA Game: Pinball FX
Game of the Year (all genres): Bioshock
Turd/Letdown of the Year: Pimp My Ride (couldn't think of anything other)
BTW: I think you're forgetting BEST MULTIPLAYER/XBOX LIVE GAME
You aint found shit!