Allergy and Asthma Network Mothers of Asthmatics http://www.aanma.org/ A good site of an organization that looks at things from the perspective of the patient and the patient's family.
Allergy and Asthma Rochester Resource Center http://www.aarrc.com/ Good clear information and links.
Allergy and Clinical Immuniology International http://www.hhpub.com/journals/aci A journal aimed at allergists and immunologists and for primary care physicians. Interesting articles but fairly technical.
American Academy of Allergy, Asthma and Immunology http://www.aaaai.org/ Information on and for their members. News and general information.
American College of Allergy, Asthma and Immunology http://www.allergy.mcg.edu/ Information, referrals and articles.
American Lung Association http://www.lungusa.org/ Plenty of information on asthma in children and adults. Particularly good pages for children and teenagers.
European Federation of Asthma and Allergy Associations http://www.efanet.org/ An excellent site with quality information. An emphasis on making information accessible and relevent with special features for children and teenagers.
General Practitioners in Asthma Group (UK) http://134.36.34.6/GPIAG A group of primary care doctors with an interest in Asthma. Contains a useful Newsletter.
Kids Health http://www.kidshealth.org/ General health pages for children includes some information on asthma.
Scottish Respiratory Site http://www.srs.org.uk/ Useful information and discussion, especially for those in Scotland.