http://tags.library.upenn.edu/tag/tagging+citeulike PennTags Feed http://tags.library.upenn.edu/makerecord/url/387 http://tags.library.upenn.edu/makerecord/url/387 Citeulike has some really great qualities -- like the fact that you can see what people are reading. But, it's sort of annoying to get citations into CiteUlike sometimes. The cloud of tags on the right of the main page shows you how popular given tags are. The bigger the tag, the more items it contains.<br />