I have a related suggestion: show someone's median karma per comment and karma per post in his/her profile. This would shed light on someone's real contribution level: e.g. someone puts up a TC article and gets 128 pts in one day vs. someone makes 64 moderately insightful, 2 pt comments.

StackOverflow awards medals to bring out distinctions. I don't think we have to go that far, but it's a similar idea.