First ad for Left 4 Dead is online, very nice, must watch!
edit: Steam links for 720p and 1080p downloads:
720p: http://store.steampowered.com/app/5139/
1080p: http://store.steampowered.com/app/5138/
LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )