In the last post, you've seen a new Google feature that allows you to refine your search. In case you're wondering how Google knows how to create clusters for related information, the answer is simple: some medical institutions label web pages related to medical research. The institution that label the results are: UCSF (University of California San Francisco Medical Center), Medline, NIH (National Institutes of Health).
If you click on the profile link, you'll go to a yet-unknown Google site: http://www.google.com/coop/profile%3Fuser%3D002279906532590700777 that gives an error. It seems it's Google Health, it works for queries like: flu, aids, blood pressure. But I still think this is a part of a much larger project. This is a clear sign that Google will launch a cooperation feature similar to My Yahoo 2.0 and every user will have a profile with bookmarks, similar to del.icio.us.