Article Sciences(site info)
Scientific article search and order engine, a service provided by Institut de l'Information Scientifique et Technique (INIST) of Centre National de la Recherche Scientifique (CNRS), France.
http://articlesciences.inist.fr/
Gateway(site info)
The National Library of Medicine Gateway allows users to search in multiple retrieval systems at the U.S. National Library of Medicine.
http://gateway.nlm.nih.gov/
5.
MedHunt(site info)
A tool from Health on the Net that searches the full text of 60,000 medical documents. Searches can be narrowed by location or type of source.
http://www.hon.ch/MedHunt/