The Administrators in Medicine (AIM) offers this only online physician directory of its kind, containing licensing background and other information and data from state government licensing boards. A very popular site featured in numerous state and national publications.
The Mayo Clinic is headquartered in Rochester, Minnesota. It is part of the largest integrated medical center in the world and has many interesting links and postings covering virtually all medical and surgical specialties.
The National Center for Health Statistics provides recent and historical life expectancy tables compiled in the United States. With links to other vital statistics information.
An interesting site with lots of information on health, living, diseases, conditions, and many other features. Not a substitue for your doctor, but informative.