I hope people don't want to include this on the default view of Wikipedia, surely. Having said that, I think it might be useful as a preference or something. I think we all need to accept though that the "reputation index" of all users will be findable, and published, probably in a userbox.
Does this only calculate your reputation only on article pages? It should. For example, people with huge debates on [[WP:TFD]], or AFD, Wikipedia:Talk, etc that get archived by a bot will be very bad editors indeed! :)
Judson [[:en:User:Cohesion]]