Still wondering if there will be any pre-order specials through Steam for this game, maybe $36.99 from Amazon for the boxed copy is as good as it gets.

http://www.amazon.com/Left-4-Dead-Pc/dp/B000PS4X7S/ref=sr_1_2?ie=UTF8&s=videogames&qid=1222386593&sr=1-2

The game is suppose to be full priced on the PC at $44.99