the majority of things have worked on it, games and otherwise. I have had a few problems, Saints Row 2 doesnt work on it, neither does ToEE dependably.

Other than that, the following games have worked well, they may have taken some patching or tweaking, but they work:

Dragon Age
Age of Mythology
The Witcher
Torchlight
Guild Wars
All the latest Warhammer games
lotro
left 4 dead 1&2
Demigod