Err.

Let me see:
Crusader Kings
Victoria: Revolutions
Final Fantasy 8
Pro Evolution Soccer 4
Football Manager 2010
Hearts of Iron 2: Armag.
Recently installed RTW for the game I'm running on Gameroom.
World of Warcraft
Left 4 Dead 2
Supreme Ruler 2020 Gold
Civilization 4 + Expansions
Romance of the Three Kingdoms IV
Medal of Honor Allied Assault (Had no idea I even had this still installed)
Battlefield Play4Free
Quake Live
PSX Emulator for Romance of the Three Kingdoms VI
GBA Emulator for Advanced Wars 2
Arcade Emulator for Metal Gear Slug 1, 2, 3, X & 4.

I think that's it. Bold are the ones I'm playing regularly nowadays.