http://www.l4d.com/
yeah, this looks pretty badass... it's made with the same graphics engine that was used in Half Life 2. There's only a teaser out showing what it'll be about... but it looks pretty awesome. Enjoy!
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New game from Valve
already looked into the game myself, in my opinion it will be very fun just the wierd thing is if there is a virus outbreak technically most of the game's monsters would be possible....but very unlikely it would happen....but i think the game will help work on teamwork and trust ALOT which will be key points during Z-Day, plus the Zeds are like Dawn of the Dead, etc. so they are faster than the Humans
Believe what you will, But when the day comes.
Will you be ready?