Healthfinder
http://www.healthfinder.gov/

One of the busiest Web sites in existence, Healthfinder is a gateway site to help consumers find health and human services information quickly. The site features links to more than 1,250 government and other consumer health resources on the Web. Topics are indexed by subject for easy navigation.

Your Disease Risk
http://www.yourdiseaserisk.harvard.edu/

This site was developed by the Harvard Center for Cancer Prevention. With this interactive online tool, you can find out your risk of developing five of the most important diseases in the United States. Better yet, you'll get personalized tips for preventing them.