http://www.left4dead411.com/

Video Presentation about the making of L4D, Get to see some cool video footage aswell.

Nice video and very ncie trailer at the end

Agreed. Can't wait till it comes.

I can't wait for this game to come out.

[rant]
Pity I doubt I will have a new computer by September so I won't be able to play it for probably several months after it has come out. I know, because I have owned HL2: Ep2 since it was released, and I still haven't played it due to the fact my computer is completely crap. God I hate my computer.
[/rant]

edit - I vote rant tags be implemented into the forums

Here's another of the many, many trailers out there.

This one, although crap in most respects, shows outdoors forest action at the end!
I know the size of outdoor areas was under question, but these look pretty open!
http://uk.youtube.com/watch?v=a42YxC1ox1c&feature=related