l4d 1 addons campaigns: 2devileyes,7hourslater,absolutezero,bblsdetour,bloodhospital,btsbeta.6,capemurder, chaostheory, city17v2.5, coaldblood,cold case, coldfear, collaboration, damit, darkblood1.9, daybreak.b3, deadaboard7, deadcity, deadecho, deadflagblues, deadindustry, deadstreet, deadthrow1.1, deathstop, diescreaming, escapefromtoronto, fairview, flygabe, fortnoesis, heavencanwait, hellstorm, Helms, highwaytohell, hunter training, ilogiccity, jsarena, lambdav1-3, laststop, mic.v1, nightterror, no mercy day, nomoreindustries, pitbeta6.0, powerstation, ravenholmwar, residentevil, runningaway, silentfear, silenthill, skydivesniper, stairwaytoheaven, suicideblitz, surroundedbythedead, thecomplexfinal, thewoods2, vienacalling1.1, withoutame.

http://www.youtube.com/watch?v=v2AC41dglnM