Authoratory
The content of Authoratory is produced by analyzing large amounts of data from PubMed. PubMed is a service of the U.S. National Library of Medicine that includes over 16 million citations from MEDLINE and other life science journals for biomedical articles back to the 1950s. PubMed includes links to full text articles and other related resources.
You can browse, search by author, or search by keyword. Say I want to find out who has written a lot on Ulcerative Colitis. I can search on the term:
…and that’ll confirm the hits:

…Click on that to get a list of authors:
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…Then chose one of the top authors produced by the search to see a display of co-authors:
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This is just scratching the surface. Try playing with it a bit, and check out the “tutorial” page. The look and interface leave much to be desired, but Authoratory seems to me like a good and potentially useful idea.
Thanks for the heads-up, Melissa!
Previous posts about other PubMed tools, mash-ups, and “alternative interfaces”:

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March 29th, 2007 at 5:44 am
[...] Authoratory [...]
May 25th, 2007 at 12:56 pm
[...] ExpertMapper is similar in purpose to Authoratory. It uses bibliometric analysis of MEDLINE data. ExpertMapper examines all medical publications that are indexed in the National Library of Medicine’s MEDLINE database. We rank the expertise of each author according to the number and type of articles that each expert has authored on the specific condition, disease, or treatment of interest to you. [...]
July 26th, 2007 at 12:24 pm
[...] Authoratory [...]