Clinical Cases Blog offers some nice options for customized medical searches. It discusses Google's offerings, but also highlights Science Roll (right), which says it's a better solution than PubMed.
Check out Scienceroll Search which is a personalized medical search engine powered by Polymeta.com. You can choose which databases to search in and which one to exclude from your list. It works with well-known medical search engines and databases and we’re totally open to add new ones or remove those you don’t really like.
ICE – Intelligent Clustering Engine: A clustering gadget for Google Desktop
Expert Systems with Applications, Volume 39, Issue 10, Pages 9524-9533, August 2012
Carlantonio, Lando M. di ; Osiek, Bruno A. ; Xexéo, Geraldo B. ; Costa, Rosa Maria E.M. da