EDIT: Hmm, nevermind, sounds like some pre-order bullshit gets you access to the demo. Nothing to see here, move along!
Left 4 Dead 2 demo up on Steam today! I believe it gives you one episode to play (or probably a part of an episode like the first game's demo did.) PC gamers, get on Steam and grab it so we can have some mini-goodtimes.
EDIT: Well, demos might or might not be out yet, I'm at work and just seeing chatter about it, but who friggen knows. Goes for the Xbox version as well. I'll be busy playing racing car game all week, so I won't get to it till later.