Alan Wake
Alpha Protocol
BioShock 2: Sea of Dreams
Blood Bowl
Borderlands
Dragon Age: Origins
Marvel Ultimate Alliance II: Fusion
Puzzle Quest: Galactrix
Red Faction: Guerilla
Resident Evil 5
Sonic's Ultimate Genesis Collection
South Park XBLA
Star Ocean: The Last Hope
Street Fighter IV
Aaaaand...
The History Channel: Great Battles of the Middle Ages! (Slitherine FTW!!!)
Plus whatever RPG it is Big Huge Games is cooking up.