Yaaaaarrrrrr - Crash Course, aka L4D1:DLC2, as Valve themselves succinctly put it, has just gone live. It's a new map, new storyline stuff and, in theory, a full Versus argy-bargy contained within a mere half hour. And all for free, not that this seems to placate the vengeful. Exit and restart Steam and it should download and install itself for you. If you don't already own Left 4 Dead (and aren't planning on picking up L4D2 instead on 20th November), there's also a celebratory 50%-off sale on from now until October 1st.