What free options are there for setting up a digg style site? I've heard of www.pligg.com any others?
Well, there's http://www.freeglobes.net/ but the site is in French. But they have an English version as well.
I personally would go with pligg, there are several good sites out there that use the pligg code for their sites.
http://www.seomoz.org/blogdetail.php?ID=1600 Digg was a very unique and original idea. No site using pligg will ever see even half that sort of success. Look at the new netscape clone of digg, they trying to copy digg and the site still suck.