Top Multiplayer Shooters (PC)

I can't recall a year as good as 2007 for first-person shooters on the PC in all my years of gaming. In the last few months we've seen the arrival of Bioshock, Enemy Territory: Quake Wars, Unreal Tournament 3, Team Fortress 2, Call of Duty 4, Gears of War, Crysis, and there are probably a couple I'm forgetting. Obviously, there's no shortage of online action awaiting shooter fans this holiday season.