Halo 2 + RSS = Stats ahoy!

Bungie have a
section on their help pages that explains their RSS feeds for player stats. If you've not started tinkering, that'll probably be your first stop.

Now then, Carnage Stats can do all sorts of cool things with your RSS stats feed. Break them down so you can see what maps you do well on, what weapons you're useless with etc... It's a great site for you online Halo 2 fans. It even has leaderboards detailing various categories.

There's also a handy page here of Halo 2 related stats tools.