No longer will you be tethered by a mere four campaigns in Left 4 Dead. After getting the beta mod tools in authors hands a few months ago, Valve is ready to unleash custom campaign support for the PC version of the game.
These new campaigns will be packaged in an easy to use single file and will support in the in game match making. That means it'll be incredibly easy to meet up with three other folks who want to play the super rare Hannah Montana campaign.
In similar news the aforementioned mod tools are will no longer be in beta form, with plenty of bug fixes for aspiring map makers.