Gametrailers TV takes a look at Valve's new zombie shooter "Left4Dead". They promise a unique premise with AI that can take on any role in the game including any of the four survivors. It also features more than just your garden variety zombies including a Witch that's a bit creepy.
Also in this clip is a brief overview of some publicity stunts that have been used for past game releases. This includes a party bus purportedly roaming the country promoting "the first presidential election for the animal kingdom."