I own a reasonably shitty computer, L2180 P4 Processor, 2 GB of ram, Geforce 8600GTS w/ 512 MB of RAM and windows vista.

Without throttling my computer, I was wondering what were the must play PC games of 2008? I'm open to anything obscure, quirky or filling a certain niche. Playing MMos have taken away from my joy as a gamer.