Dave has a great post up about the list of sites banned from Digg. It’s a great piece of work. Dave got the top 10,000 domains from Alexa and then tested them against digg to get back a list of 183 banned domains. He also makes an insightful point about UGC sites that are banned:

User Generated Content sites without subdomains. One bad actor on these sites can ruin it for everyone.  Popular UGC sites like Myspace, Squidoo, 43Things, Geocities are all banned, whereas sites like Typepad, Blogspot, Wordpress do just fine because it is easy to ban one bad actor. If I were Seth Godin, I’d give Squidoo lenses their own subdomains pronto - there is good content on Squidoo that will never see the light of Digg.