You guys should all check out Fort Zombie from Kerberos (made as a side project by the people responsible for Sword of the Stars).
It isn't as serious or realistic as Dead State is trying to be, but its the same kind of fun. Skills, guns, melee, fort building, food/medicine/supplies gathering, making traps, rescuing survivors, etc.
It got bad reviews when it came out because it was buggy, but its much better now, and I really enjoy it.