I recently found out about it ,but there's this game ''State of Decay'' releasing in next week or so for XBLA and later for PC. It's kinda free roam zombie survival but from what I've seen it looks really nice and is more centered around you finding supplies and survivors,building these little communities and supplying them etc ,and for 15-20$ it looks damn good. http://www.youtube.com/watch?v=rm7H3KEzE6g