I usually play L4D online, Grand Theft Auto 4 Online, Gears 2 Online(though I SUCK at it).
Edit: OH, I'm a tard. I also play GH: World Tour online and offline.
and Not on live...
Fable 1 & 2, Dead Space, GTA4, Legendary, Mirrors Edge, & Devil May Cry 4.
My boyfriend play's more than I do. He plays all the same games... feel free to message whenever :]