General health web sites you can trust, according to the Consumer and Patient Health Information Section of the Medical Library Association, a group of health information professionals:
A service of the U.S. National Library of Medicine and National Institute of Health
A service of the National Health Information Center and the U.S. Department of Health & Human Services
Information from the American Academy of Family Physicians about common medical concerns and conditions that has been reviewed by physicians and patient education professionals at the American Academy of Family Physicians
A site from the Medical College of Wisconsin with health information on many topics, and news and features.