-Asthma

www.allergy.mcg.ed  This is the website of the American College of Allergy, Asthma and Immunology.  This is the best overall website for asthma sufferers.

www.lungusa.org/asthma  This is the website of the very credible and well-researched American Lung Association.  Also an excellent place to start.

www.asthma.about.com/mbody.htm  Contains very basic information that's easily understood.

www.aaaai.org  This is the website of the American Academy of Allergy, Asthma and Immunology.  This includes not only the basics on asthma, but also the latest research.