Telltale Games have recently opened for pre-orders of their new Walking Dead game. Here's the trailer: http://www.youtube.com/watch?v=RtkkHAmgYWs&feature=player_embedded
Their website says the game will be available Spring 2012 so watch this space, and make sure you buy a copy of our next Walking Dead book, out later this year. Or, if you haven't already, The Walking Dead: Rise of the Govenor which came out last year.
Here's a free sampler of the first three chapters for those who are interested in finding out more.