Originally Posted by Corwin 
Life's far too short to waste time cheating at voting in online polls!! I suppose we could always disable guest voting!!
couldn't you simply check the IP instead of just placing a cookie? This would already complicate things for the cheaters. (Although I doubt it was cheating, as first MotB, then Hellgate, then The Witcher got hundredths of votes within a few minutes, more likely either one butthead trolling or several ones having a race (with the Witcher guy winning, gratulations)
Anyway I think you should reset the poll or at least delete yesterday's votes.