The "ass crawl" was one of my favorite things...I don't know how useful it will end up being, but quick turning around onto your back, and shooting a guy off the top of the building behind is pretty sweet.
LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )