Shame you haven't allowed multiple voting (ie 3 per person), not sure whether you can change this after the poll is started, if so, please do.
That would give much more thorough review. Many have multiple favourite sites and it's hard to pick one. You could prefer site X for poker, site Y for dice and Z for sports betting etc.
Edit:
+1 for SafeDice, as per Equinoxx's post below
Yap..because there are different types of gambling. Lets say I would vote PD for dice and Directbet for sportsbetting.
One vote per user would be good if the availble site provides the same game.