... Or just leave it off altogether and let GForum increment the guest ID from 0 to infinity ;-)
Consider a combination of IP and username - for a logged in user, let them vote unless that user has already voted. If it is a guest voting, track their IP and only let the IP vote once.
Going by just IP isn't a good idea - that would mean all Gossamer Threads employees only get to vote once! What happened to sending all your employees to skew the results of a poll? hehehe
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com