Left 4 Dead

Left 4 Dead looks like it is going to be pretty sweet.

Left 4 Dead is an upcoming multiplayer co-operative survival horror game by Turtle Rock Studios and Valve Corporation (a collaboration that has previously produced Counter-Strike: Condition Zero, as well as maps and the official bot for Valve's Counter-Strike: Source). The expected release date for Left 4 Dead is early 2008.^[1] The game has been built using Valve's Source engine.

The game was first revealed in the Christmas 2006 publication of PC Gamer UK with a six-page article describing a playthrough at Valve's headquarters.

The game was first playable at the Showdown 2007 LAN in San Jose, it was also playable from August 2-5 at QuakeCon 2007. A Valve booth allowed a team of 4 survivors to play against AI controlled bots as well as 2 guest developers from Turtle Rock Studios. However, the general public was only allowed to play as the four survivors.

http://en.wikipedia.org/wiki/Left_4_Dead