Healthfinder

http://www.healthfinder.gov/
Healthfinders is a gateway consumer health and human services web site created and maintained by the U.S. government.

Mayo Clinic Health Oasis

http://www.mayoclinic.com/
Directed by a team of Mayo Clinic physicians, scientists, educators and writers, This site contains features such as Ask the Mayo Physicians and Ask the Mayo Dietitian questions and a glossary of medical terms.