Right now, this second, I have the following games installed on my PC.  (I have alot of Xbox games, but I am talking about the PC at the moment)  So here they are:

Call Of Duty 2
Americas Army
Fahrenhiet
Mark Ecko's Getting Up
Oblivion
Need For Speed Underground 2
NBA Live 2004
Tiger Woods PGA Tour '06
Total Overdose
Tomb Raider Legends
Hot Wired
Prey Demo (Didn't like it enough to get the game)
F.E.A.R.
Half Life 2
Half Life
Counter Strike: Source
Ghost Recon Advanced Warfighter
Far Cry
Splinter Cell Pandora Tomorrow (I already beat the other two)
Unreal Tournament 2004