We received a brief press release from Valve, announcing Left 4 Dead, a Source Engine powered co-op action game from Turtle Rock Studios. The game is due out next year.

"By leveraging its industry-leading AI technology and years of Counter-Strike development experience, Turtle Rock is building upon the elements that make Counter-Strike successful and applying them to Left 4 Dead," said Gabe Newell, co-founder and president of Valve. "What Counter-Strike did for multiplayer action games, Left 4 Dead will do for co-op games."