Is this considering all games in Wii's library or just 2007 releases? Well, I'm asuming all games...
Best Graphics: Metroid Prime 3
Best Sound Effects: Metroid Prime 3
Best Replay Value: Super Mario Galaxy
Best Music/Soundtrack: Super Mario Galaxy
Best Story: Zelda:TP
Best Multiplayer: Wii Sports
Most Innovative Feature in a Game: Super Mario Galaxy (gravity)
Most Innovative Game: Wii Sports
In specific catagories:
Best First/Third Person Shooter: Metroid Prime 3
Best Racing Game: Excite Truck
Best RPG: Super Paper Mario
Best Action/Adventure Game: Zelda:TP
Best "VC" Game: Super Mario World
Game of the Year (all genres): Super Mario Galaxy
Turd/Letdown of the Year: Mario Party 8