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It could be interesting to be able to look for users which earned a high number of badges for a specific tag (such as java, asp.net-mvc, lisp, etc...).
With that possibility we could know which are the most expert users on a specific topic and gain insight by looking at the questions they answered.
Maybe it is already possible with search queries?
Just click on Tags, click the tag. Click the "stats" tab, note the users in the "Last 30 days" and "All Time" lists. I didn't think this warranted pictures :)
