Health
Netwellness.com
Columbia Medical Guide
Diseases Database - an alphabetical listing of diseases.
KidsHealth - Excellent, searchable information on young people's health for parents, children, and teens.
Mayo Clinic - covers diseases and conditions; treatments, and drugs.
National Library of Medicine - The National Library of Medicine is the world's largest biomedical library. Type it in the search box and find information for both laymen and medical professionals.
U.S. National Library of Medicine - the world's largest medical library
Virtual Hospital - a digital library of health information