I too wasn't sure what it was all about, but (and most sites should take a hint here) you made it very easy to figure it out. I clicked the button and off it went.

I'm curios as to why you went with two different styles though. When I start I have radio buttons and a submit on the right of the picture, then you go to the voting blocks on the left of the picture. Why the change? It would maybe be better to go with the more familiar (Hot or Not) style of selections below the picture.