Sweet, I can't wait to try. Now all I need is Halo 2.
Pull your Halo 2 stats into Excel
Check this out. This guy built an Excel spreadsheet that will pull in the Halo 2 RSS stats feed from Bungie and let you look at your data in all sorts o' ways. Now I can see exactly which map I suck the most at (Beaver Creek) and which one I actually do pretty good at (Zanzibar.) Once you get it set up, you can refresh the data as much as you want and it will pull in the most recent data from Bungie.net.
If you have Excel (and Halo 2) you MUST get this spreadsheet.