http://www.medscape.com
Medscape, Inc. Get your medical information from the site that doctors use. This site offers original, peer-reviewed reports as well as journal articles organized by medical specialty.

http://www.webmd.com
WebMD, Inc. Come for the content, stay for the 'community'. This site offers health news and information, a physician directory and condition-specific "communities" or support groups.

http://www.drkoop.com
drkoop.com is a company led by Dr. C. Everett Koop, former U.S. Surgeon General, and others who are dedicated to improving the quality of people's lives by empowering them to improve their health.

http://www.cancer.org/
The American Cancer Society is committed to fighting cancer through balanced programs of research, education, patient service, advocacy, and rehabilitation.

http://www.americanheart.org/
The American Heart Association is a national voluntary health agency whose mission is to reduce disability and death from cardiovascular diseases and stroke.

http://www.lungusa.org/
The mission of the American Lung Association (ALA) is to prevent lung disease and promote lung health. Founded in 1904 to fight tuberculosis, ALA today fights lung disease in all its forms, with special emphasis on asthma, tobacco control and environmental health.

http://www.aakp.org/
Founded over 30 years ago, the American Association of Kidney Patients (AAKP) exists to serve the needs, interests and welfare of all kidney patients and their families. Its purpose is to help patients and their families cope with the emotional, physical and social impact of kidney failure, thereby enabling them to resume productive and satisfying lives.

http://www.nih.gov/
Begun as a one-room Laboratory of Hygiene in 1887, the National Institutes of Health today is one of the world's foremost medical research centers, and the Federal focal point for medical research in the U.S. The goal of NIH research is to acquire new knowledge to help prevent, detect, diagnose, and treat disease and disability, from the rarest genetic disorder to the common cold.

http://www.nimh.nih.gov/
The mission of the National Institute of Mental Health (NIMH) is to diminish the burden of mental illness through research. This public health mandate demands that we harness powerful scientific tools to achieve better understanding, treatment and, eventually prevention of mental illness.

http://www.patientinform.org/PI/home.jsp