Just an idea -
when you ban someone, the next (and hopefully last) time they visit your forum, vB realises they have been put on the banned list and pops up "you have been banned." BUT it also pops a persistant cookie onto their box which is read by your forum every time they attempt to come back - regardless of their new email address or nick.
Sure its not hack-proof but as most people tend to stick primarily to one PC, it would make life annoying for them. Until they found and wiped the cookie obviously...
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