Bumping this a bit since I've yet to get this working after a few months. I PM'ed LK on how to do this and he pointed me to the BLAM template
thread (look near the bottom) where he and Bookie explained how to do this on a 6.3.x board. I tried doing what was instructed, but as TheX said, it doesn't seem to be working on 6.4+.
Thanks for any help. This would be a great feature for sites that use special avatars or post ranking systems.