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. The best starting place found for cancer information.
ParentsPlace.com - Not health-only, but this commercial site contains many pages of sophisticated, reader friendly information on children's health issues.
Medical Matrix - 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.
Memorial University Medical Center http://www.memorialhealth.com
St. Joseph's Hospital http://www.sjchs.org/
Candler Hospital http://www.sjchs.org/
Wikipedia - http://en.wikipedia.org/wiki/Dental_implant
American Association of Oral & Maxillofacial Surgeons - find information about oral and maxillofacial surgery including cancer, dental implants, sports safety, jaw surgery, and more
American Dental Association - ADA Online - access to news, publications, and products and services related to dental health
American Medical Association - another useful site with links to consumer health information, vast AIDS information center, searchable database of more than 650,000 physicians