Medicine 

MedlinePlus Health Information
Good health information from the world's largest medical library, the National Library of Medicine.  Health professionals and consumers can depend on it for information that is authoritative and up to date. MEDLINEplus has extensive information from the National Institutes of Health and other trusted sources on over 600 diseases and conditions. There are also lists of hospitals and physicians, a medical encyclopedia and a medical dictionary, health information in Spanish, extensive information on prescription and nonprescription drugs, health information from the media, and links to thousands of clinical trials.

Health Web
Features upon entry an extensive subject list and with keyword searching. It gives access to free sites for searching the MEDLINE database plus user guides for searching. Links to other websites  that provide tips on evaluating health related informationon the Internet are also included as well as links to medical and general Internet search engines.

Medpedia
"Medpedia Project announced the public launch of the beta version of a
technology platform for the worldwide health community. Medical knowledge is contributed and maintained by health experts around the world, and freely available to everyone. Harvard Medical School, Stanford School of Medicine, Berkeley School of Public Health, University of Michigan Medical School, and other leading global health organizations are contributing in various ways to Medpedia. It will, over time, be a repository of up-to-date, unbiased medical information, contributed and maintained by health experts around the world, and freely available to everyone. Medpedia is applying a new collaborative model to the collection, sharing and advancement of medical knowledge that, over time, will produce the world's most comprehensive resource."

MedicineNet.com
Reliable doctor produced health and medical information in an easy-to-understand format. Assists in keeping you informed on all aspects of health and medicine.  Gives the latest health and medical news as per your topic needs.  Has a search function for its  A-Z listings in the Diseases and Conditions, Procedures and Tests, Medications, or MedTerms Medical Dictionary sections.

Association of American Medical Colleges
This site presents information relating to medical education, news, and research.