There is a game called Dead Rising 2 coming out for PS3, XBOX 360, and PC that looks awesome, during the E3 coverage on G4 they showed a video of it and pretty much you go around using anything as a weapon. This guy was in a mall and he grabbed some old person in a wheelchair and started using them to run over zombies. Apparently you can also use things like a teddy bear, a baseball bat, etc. Comes out late August.

I also tried a demo of Zombie Apocalypse on my PS3, you just kill zombies with guns and grenades and flamethrowers and shit like that over and over, and your kill count goes up. You get points for not dying, for how many zombies you kill, and for saving random people... it was pretty fun, I'll post more if I buy the game.