Although Left 4 Dead 2's launch is less than two months away, its original game got its second batch of downloadable content today. Titled Crash Course, the DLC is set between the No Mercy and Death Toll maps found in the original game and accommodates single-player, cooperative, and competitive action. According to developer Valve Software, the map should take just 30 minutes to complete, but it will add new locations, new dialogue, and an "explosive finale."

Crash Course is free to PC gamers via Valve's Steam service, but Xbox 360 owners will have to drop $7 (MSP 560) to pick it up. There was a brief outcry this morning when Xbox Live listed the game as costing $10 (MSP 800), which was a mistake noted by the service's director of programming. In April, Valve released its first Left 4 Dead add-on, the Survival Pack, for free for both the PC and 360. Until October 1, Left 4 Dead is 50 percent off on Steam.