It looks like Steam has extended the L4D half off sale until Tuesday 6pm GMT, so get it while you can.
http://kotaku.com/5154580/left-4-dead-still-cheap-til-tuesday
I just picked it up yesterday, it was just too good of a price to pass up! Plus I can try out my new Nvidia GTX 260 video card with it as well! :D
starcraft: "I and every PS3 fanboy alive are waiting for Versus more than FFXIII.
Me since the games were revealed, the fanboys since E3."
Skeeuk: "playstation 3 is the ultimate in gaming acceleration"