The latest zombie-based game to hit Xbox Live Arcade is State of Decay, a hybrid 3rd-person, action/adventure/strategy/simulation take on the genre by Undead Labs.
The concept definitely sounds more interesting than previously released zombie titles, so make sure to at least queue up the trial to check it out.
State of Decay (1600 Microsoft Points)
The end is here. Life as you knew it has gone to hell after the mother of all zombie outbreaks. Now you and the few scattered survivors must band together to survive and rebuild in a 3rd-person action game set in a dynamic open world. You choose where to make your stand, designing and fortifying your home base, performing daring raids for food and ammunition, and rescuing other playable survivors with unique talents.