Spurl.net is one of the more interesting web page recommendation systems I've seen. Some of the novel features: No download required. No login required. Doesn't require rating tens of sites before seeing recommendations.
The user base appears to be very small right now. The site appears to try to generate related sites even when only a couple users have seen a site, so the quality is sometimes laughably bad, but the quality is higher on more popular URLs. It'll be interesting to watch this site as the user base grows.