Valve have now released the DLC Crash Course for Left 4 Dead. This is great news for those waiting for L4D2, and if you’re playing the PC version you will get it the next time you restart Steam. 360 owners will require a little bit more work. Heck, Valve are generous enough to offer Steam’s Left 4 Dead at 50% of the normal price until October 1st.

Entitled "Crash Course," the latest DLC delivers new single-player, multiplayer and co-operative gameplay to both platforms. Targeted for release in September (and making it now, right at the end of it), "Crash Course" bridges the gap between the end of the "No Mercy" campaign and the beginning of "Death Toll" in the original game, expanding the game universe with new locations, new dialogue from the original cast, and an explosive final.
While containing both Survival maps and a Co-operative Campaign, the primary goal of "Crash" is to deliver a complete Versus mode experience in just 30 minutes, resulting in a streamlined version of the game’s existing Versus campaigns. A recharge timer for infected teammates has also been added, and item spawn behavior has changed for more balanced gameplay.
Left 4 Dead is an action horror game from Valve that blends the social entertainment experience of multiplayer games such as Counter-Strike and Team Fortress with the dramatic, narrative experience made popular in single player action game classics such as the Half-Life series of games. Released in November of 2008, L4D has earned over 50 industry awards from outlets around the world and sold over 3 million copies worldwide.