Video: Left 4 Dead co-op zombie slaying

We have to admit it, the concept behind Left 4 Dead is awesome-on-a-stick. Like most gamers, we love cooperative gamin, we love squad based shooters, and we love killing zombies. Left 4 Dead takes all those things and combines them into a delicious sushi roll of carnal delights. Oh, and don't forget that the zombies (known as "the infected") are playable as well, which provides the final touch of wasabi to the aforementioned, metaphorical sushi roll. We rounded up a couple of off screen videos of the game from QuakeCon 2007. Check 'em out and dream of the day you can join in the fun (which should be this winter for 360 owners).

Be warned: videos are violent and possibly NSFW.