Research and Library Links
MedicineNet
Content-rich commercial site includes interactive groups, ask-the-doctor feature, medical dictionary, comprehensive drug information, medical news, disease-specific information, and links.
Medscape
Searchable commercial collection of full-text articles from such useful sources as the National Institutes of Health and the Centers for Disease Control and Prevention.
Oncolink
Huge collection of cancer information and links based at the University of Pennsylvania. A great starting place for cancer information.
Healio
Physician maintained commercial database of annotated health links. Oriented toward medical professionals, but accessible to an educated lay person. A keyword search gets you to a subject index from which you navigate to the links you want.