This is a very professional Flash program that pulls stats from Bungie's Halo 2 website as well as RSS feeds. The designer, Marshall Beachy, explains in great detail how to set this program up for your website or forums signature. Notice the 3 buttons at the top left? Click on them for clan stats and recent games. If you are a Halo 2 player, this is a must!
Source:Marshall Beachy (http://www.haloimpulse.com/sig/directions.html)