http://tags.library.upenn.edu/tag/rank PennTags Feed http://tags.library.upenn.edu/makerecord/url/2189 http://tags.library.upenn.edu/makerecord/url/2189 IMDB -- but customizable. good idea. Users make lists of movies and then comment on each others lists. A nice feature is called &quot;affinity&quot; which I think we might like to do with Penntags at some point. Affinities is basically like &quot;people who like this also like&quot; but is more -- this person has a lot in common with these people.<br /> http://tags.library.upenn.edu/makerecord/url/2171 http://tags.library.upenn.edu/makerecord/url/2171 <p> CollaborativeRank is an attempt at building a search engine for del.icio.us that returns helpful/timely search results. The central idea behind CollaborativeRank is to motivate people to provide helpful/timely URLs by rewarding them for doing so. Currently, the rewards are as follows: </p> <ul> <li> greater influence on search rankings for a given query </li><li> a higher ranking as an expert for a given query </li><li> a higher ranking overall among all contributors </li> </ul> <p> I believe that these rewards would give people the feeling that they are having some influence over the URLs that others visit. I suspect that many people would feel a sense of satisfaction from influencing others in this way. </p>