http://www.left4dead411.com/left-4-dead-preview-pg1
A very detailed description of playing as both the Survivor side, the Infected side, and how the Director works.
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 )