There was a time when I had like 20 games installed at the same time, but because of a serious lack of disk space (can you believe that I wrote "dick space" at first
) I don't have that many now. I do try to stick to one game at a time though. It's much easier to get immersed in the game that way.
Anyway, here's the list of my currently installed games:
Caesar III
Operation Flashpoint Game of the Year Edition
BeTrapped! Demo
Gabriel Knight 1
GTA III
Of these games I'm only playing Operation Flashpoint at the moment. Those that has played this game knows that it's more than enough on its own.