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Genetics Home Reference (GHR) provides free access to consumer-friendly information on medical genetics to patients and their family members, health care professionals, and the public. The site offers summaries for a broad range of inherited conditio...

Yahoo! Answers is a new way to find and share information. You can ask questions on any topic, get answers from real people, and share your insights and experience.

Mayo Clinic — Comprehensive medical diagnosis and treatment; locations and services; request an appointment.

Learn how to do just about everything at eHow. Expert Village is now a part of eHow, adding expert How To videos to eHow, the world

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The eMedicine point-of-care clinical reference features up-to-date, searchable, peer-reviewed medical articles organized in specialty-focused textbooks, and is continuously updated with practice-changing evidence culled daily from the medical literat...

Nature - the world

Information about many types of rare diseases and disorders, including causes, symptoms, diagnosis and treatment, including orphan drugs. Site also offers news about rare diseases, orphan drugs, and clinical trials.