I'm a big fan of the zombie genre, and
Day Z is the zombie mod for ARMA II/Operation Arrowhead. I'm unfortunate in that I don't own ARMA II/Operation Arrowhead, but a standalone Day Z is coming out shortly before December.
But that's not what I came to talk about. The mod is all about surviving on the zed infested island. You need to sleep, find food, fight off bandits, and other riff-raff that happens to plague you. There are even vehicles you can find and drive.
This could be done perfectly with T2000. Between hit detection for plugging those shambling corpses, to the food and medical attention required after getting plugged by a bandit.
Any other thoughts?