A late addition

I know its a bit late in the game, but I feel that with the release of the Orange Box I have to include Team Fortress 2 as on of the games I am basing my research off of. After some "research time" with TF2 I realized that it hits on every point I am trying to make with this project. This game was only released with only 6 maps and it is very very quickly on its way to toppling any Counter-Strike game in terms of player minutes per month (just click the link that says "View detailed statistics by game"). So I think it would be silly of me to not include this game.