(Via), It appears that Microsoft's hit game, Halo 2, supports RSS. Well the use of RSS in video games is unexpected but actually appears to be interesting. According to Dave, Bungie (the company behind Halo) provides an RSS feed for each player, keeping track every game played.

Not only do they track every single kill in every single multiplayer game (along with who did it, how it was done, and where it was done), but they put all this data into a feed you can subscribe to and never miss out on post-game scrutiny.