To make the leader board more competitive and what I believe to be more accurate, I've set the weight of the last three seasons to have five times the impact on your score as well as (with help from Tarogato) a formula that reduces your score if you have less than around 350 games.
($AdjustedWeightScore)*(-(1.015^(-$GamesPlayed)-1))
The leader board will be an ongoing project and I plan to have leader boards for each weight class as well as more adjustments for a score system that makes the leader board more competitive.
I also want to give credit for Chimmy for helping create CSS code.
Enjoy.
http://leaderboard.isengrim.org/