Call of Duty is a monster franchise, and what better way to expand that franchise then to unleash it, World of War style, on the iPhone and iPod touch -- and add Zombies. Call of Duty: World at War: Zombies [$9.99 - iTunes link] contains only one map right now, "Nacht der Untoten" (Night of the undead) but allows 4 player multiplay via WiFi/internet, and 2 over Bluetooth. There are three control schemes, achievements, leader-boards, and the promise of in-app purchases (map expansions?) later.
So, Call of Duty fans and Zombie fanatics, how're you liking your first iPhone experience?