The fan-made Left 4 Dead campaign I Hate Mountains has just been released for download, and we just have to link it - after all, mountains suck! Big, hard and annoying. In the campaign, the original survivors have to fight their way through five levels and flee into Canada to escape from the infected zombie horde.
A Left 4 Dead 2 version is supposed to be in the works. The team behind I Hate Mountains has previously worked on the Portal-mod Portal Prelude, and the campaign is available for download on www.ihatemountains.com.