Healthful Living Resources
http://www.ncwiseowl.org/kscope/TeacherHut/ContentColsm/index.html#health

American Medical Assiciation
http://www.ama-assn.org

The Web Doctor
http://www.webmd.com/

Dr. Koop's Website
This site, edited by former US Surgeon General, C. Everett Koop, MD, provides a wide range of health information.  You can access drug-interaction databases, late-breaking health news, and information about clinical trails.
http://www.drkoop.com/

Mayo Clinic
http://www.mayoclinic.org/