And its cross-platform and only $10 on PC. Any reason you wouldn't just get the PC version if you had the rig to run it? You get free Live Gold play on PC.
There is a contest through the holidays that you get an entry in if you download the new Games for Windows client and play a GFW Live game (Fallout 3, Universe at War, GTA IV, etc). They've just added marketplace even though it isn't much right now. You're better off downloading the update manually, every PC I have fails if I try to run the update automatically when I start a game.
EDIT: PC one is through J&R, so you'd have shipping.