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World Health Organization: Asthma
http://www.who.int/health_topics/asthma/en/

American Academy of Allergy, Asthma and Immunology
http://www.aaaai.org/

The National Asthma Council Australia (NAC)
http://www.nationalasthma.org.au/

American Thoracic Society (ATS)
http://www.thoracic.org/

European Academy of Allergology and Clinical Immunology (EAACI)
http://www.congrex.com/eaaci2004/

European Respiratory Society (ERS)
http://www.ersnet.org/

European Respiratory Journal and European Respiratory Review
http://www.personal.u-net.com/~ersj/

Thorax Online - The Journal of the British Thoracic Society
http://thorax.bmjjournals.com/