Association of Managed Care Dentists
A non-profit organization dedicated to the education of dentists and related professionals about the emerging managed care delivery systems.
Content-rich commercial site includes interactive groups, ask-the-doctor feature, medical dictionary, comprehensive drug information, medical news, disease-specific information, and links.
Physician maintained commercial database of annotated health links. Oriented toward medical professionals, but accessible to an educated layperson. A keyword search gets you to a subject index, from which you navigate to the links you want.