Left 4 dead, GTA IV online free mode via xbox live, halo 1 and 2, just to remind myself WHY I bought halo 3 and ODST in the first place. Dont get me wrong, all the halo games were great, but sometimes we just need to respect the originals.
Fable 2 also, and star wars: battlefront 2.
Oh, and just cause. I love jumping out of planes from 50'000 feet then pulling my chute at 200 feet after a long, cloudy, awesomely soundtracked freefall.