Health finder: (From site) "Health finder is a free guide to reliable consumer health and human services information, developed by the U.S. Department of Health and Human Services. Health finder can lead you to selected online publications, clearinghouses, databases, Web sites, and support and self-help groups, as well as government agencies and not-for-profit organizations that produce reliable information for the public".
Web MD: Web MD offers the latest information on a wide verity of health issues. Section such as "Ask an Expert" and "Talk With Others" lets you interact with people that are familiar with specific health topics.
Centers for Disease Control and Prevention: An Agency of the Department of Health and Human Services, the Centers for Disease Control and Prevention site provides comprehensive information on the treatment and prevention of a host of diseases. It also offers general and travelers' health information, data and statistics, and publications, software, and other products on health issues to order.