Left 4 Dead is a new game by Valve Software.  The guys that brought us Half Life 1 & 2, Portal, and Steam.   I've actually had this game for a while and just haven't written something up about it. The premise of the game is that you and three others are trying to survice a zombie apocalypse.  How the zombies got there is essentially your Dawn of the Dead/Shaun of the Dead/World War Z sort of scenario.  The player and the other survivors have to slug their w