Just downloaded luke_repwalker.pl. Good stuff, but it only solves part of my problem. It tracks my reputations just fine, but since reputation gets translated into XP in a nondeterministic fashion, there is still guesswork involved.

I would still like to see the XP nodelet say "You have gained 1 XP from voting" or "You have gained 1 XP for logging in" or "You have gained 1 XP from node 1234".