I've been busy retaggin questions since I got my retag privileges.
Shouldn't there be an incentive to retag wrongly tagged questions, other than the urge to do things right?
I'm mean, the only "badge incentive" for retagging are "Firs edit" (Organizer) and "Creation of a tag used 50 times" (Taxonomist). The first one is easy to get, and the second one, right now in SO is almost impossible to get without cheating, that's editing 50 questions with an unlikely tag. Taxonomist I guess, could encourage wrongly tagging.
Is this really a problem?
We could have an "Tagged 200 question" badge, so people go for that badge, instead of taxonomist.