Nice idea.. Though I wouldnt suggest checking the db against IP, it wouldnt give a successful result (dynamic ips) and besides it would add an unnecassary SQL query load (not a very fast one either) to your MYSQL server.
On the other hand, vbulletin already tags your visitors (guest or members) if they can accept cookies and checking this cookie would give much successful results. It would be easier to code the hack too.
Regards,
Logician
Ps. I dont volunteer for the hack though, just gave my 2 cents hehe
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