Every year I think the zombie craze is over I end up playing another zombie game and end up loving it. Most recently I played The Walking Dead Season 2. Wow! Not much of a game but more of an interactive fiction, but just WOW!
Also, some of the lesser known zombie games tends to draw my attention longer. How To Survive is a crazy and fun little RPG shooter action game thing. Plus co-op!
However, the king of all zombie games has to be 4-player co-op Left 4 Dead 2! 2 TV's, 2 XBOXes, 4 mates, one awesome gaming experience! Had some of my most memorable gaming adventures in this setup!