On Mon, Dec 6, 2010 at 3:05 PM, Thomas Dalton <thomas.dalton(a)gmail.com> wrote:
If they've never edited (including deleted edits),
then it should be
safe to delete them from the database, but you would have to do it
manually as far as I know.
http://www.mediawiki.org/wiki/Extension:User_Merge_and_Delete should do it.