Agency for Healthcare Research and Quality (AHRQ) 

DailyMed provides high quality information about marketed drugs. This information includes FDA approved labels (package inserts). 

Diagnostic Procedures Handbook - searchable database of

Genetics Home Reference provides consumer-friendly information about the effects of genetic variations on human health.
 is a free guide to reliable health information, by the US Department of Health and Human Services.

Mayo Clinic is a not-for-profit medical practice dedicated to the diagnosis and treatment of virtually every type of complex illness.

MedlinePlus MedlinePlus brings together authoritative information from NLM, the National Institutes of Health (NIH), and other government agencies and health-related organizations.

Nursing Center- links to WWW sites in clinical nursing, education, and research.

Lab Tests Online offers noncommercial patient education on blood, urine, and other lab tests to help health care consumers better manage their care.

Lippincott's Nursing Center - full-text articles and table of contents searching capabilities for nursing periodicals. 

National Guideline Clearinghouse - a public resource for evidence-based clinical practice guidelines. NGC is an initiative of the Agency for Healthcare Research and Quality (AHRQ), U.S. Department of Health and Human Services

PDRHealth - Drug information guide and health resources for consumers from the publishers of the Physicians' Desk Reference.

U.S. Food and Drug Administration (FDA)

Virtual Nursing Center - links to nursing and medical resources on the WWW, such as databases, online journals, and procedures.