Valve releases Left 4 Dead 2 PC SDK just in time for the holidays

Left 4 Dead 2 on PC has just received a massive update, with both authoring tools for custom campaigns and a support package for those who just want to play custom games coming down the internet's chimney. That second part might not be so exciting if it weren't for the glorious detail that it "allows running ANY map [their emphasis], including custom maps made for the original Left 4 Dead."

All your old favorites like the Mushroom Kingdom (with zombies) and Lego (with zombies) -- totally playable in Left 4 Dead 2. The only thing that the Left 4 Dead 2 Team asked for in return was "to get to play your custom maps" in their game, so let's all do them a favor and get right on that. We're personally hoping to see a Back to the Future 2 (with zombies) mod by the weekend.
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[Thanks, Cj]