This happens to me every holiday season... but now that I have a 360, as well as more grown up responsibilities, I am finding that I still haven't played tons of great titles that I purchased.
The most glaring ones that I haven't begun as of yet are Mass Effect, Far Cry 2, Fallout 3, and the two NWN2 expansions. Other titles I mean to begin are Burnout PC, Crysis: Warhead, Gears of War 2, Halo 3, Mirror's Edge, Spore, Fable 2, Dead Rising, Condemned II...
Gosh, I sorta forgot I was playing Psychonauts.
I guess I am getting worse at this being a gamer thing.
Any titles you've been meaning to have a crack at, but for some reason haven't?