Ye' old general discussion board. Basically, for everything that isn't covered elsewhere. Come here to shoot the breeze, shoot your mouth off, or whatever suits your fancy. This forum is not for asking programming related questions.
I dont think I know a pre-coded script for that, but it wouldnt be hard at all to program that on your own, just have a table for your sites and a table for your vote, allow each ip to vote once every 24 hours, and have a page that orders the rows in your site table in the order you want. finally have it increment the in/out when people vote/go to a site.