I have 2 users with the same user name i.e. 'mike'. i filter by email address however, when listed, both users render the same url.
For instance, assume comments as follows:
mike (1) = url1.com
mike (2) = url2.com
however, the top commentators widget renders:
mike (1) = url1.com
mike (2) = url1.com
ps also, an option to select target=blank on the url would be really nice. :-)
http://wordpress.org/extend/plugins/top-commentators-widget/