If this doesn't reaffirm the fact that cooperative gaming is getting more popular, I don't know what is.
The official 30 second TV spot for Left 4 Dead, part of the 10 million dollar ad campaign, has gone live. And while the commercial shows off zombies, guns, and the impending apocalypse, it's the message of co-op that comes across as the final slogan hits the screen.
Yes, there is a pending zombie apocalypse, bring friends.
Source: Gamevideos.1up.com