Done – finally done with the first step
March 3, 2008 
I finished comparing the MeSH terms with the citations in PubMed/Connotea & CiteULIke
My results:
the number of connotea tags that = MeSH headings 55/240 (22.9166667%)
the number of connotea citations that were also found in PubMed 118/240 (49.1666667%)
the number of citeUlike tags that = MeSH headings 69/240 (28.75%)
the number of citeUlike citations that were also found in PubMed 156/240 (65%)
Next step is to start writing the paper. I will start with the background information on CiteULike – hard to find.
I googled a question about searching tags and your blog showed up first!