Disposable games:
TOB
NFS Prostreet
Overlord
Saints Row

Released games but have not bought:
Dark Sector (online purchase only)
RBSV2
Oblivion GOTY (soon)

Upcoming games:
Jericho 2 (no confirmation)
Gears of war 2,3
Assassins Creed 2,3
KUF2
Mass Effect 2,3
COD5
Age of Conan
WoW: WOTLK