if you like the half life 2 source engine, and you like zombies (of sorts), and you like multiplayer "co-op" game play ala serious sam (pure adrenaline chaos), get this game.
http://www.l4d.com/
it's sort of like half-life 2 meets 28 days later. zombies (well they're not really zombies, they're infected with some variant of "rage") are very fast and very strong. all out shoot 'em up madness. AND, there is a co-op game where you can play as either the human survivors OR the infected. very little strategy involved, but it sure is a good stress reliever after a long day at the office. f'ing fun as hell so far.
