As promised, Valve Software has released the Crash Course DLC for their hit zombie shooter, Left 4 Dead. This free content update bridges the gap between the end of "No Mercy" and the beginning of "Death Toll" with a new campaign that's playable in singleplayer, co-op, versus and survival mode. Just restart your Steam client to start downloading!
To celebrate the DLC's release, Valve has announced that Left 4 Dead will be 50% off on Steam for the next three days. So if you don't already own this awesome title, here's your chance to grab it super-cheap!