Asthma and Allergy Information and Research: AAIR 
UK based site, with lots of helpful information on asthma, allergies, hayfever.
http://www.users.globalnet.co.uk/~aair/index.htmAsthma Clinical Research Network: ACRN
A multi-center group designed to conduct multiple studies of asthma. Dedicated to conducting well designed clinical trials for evaluation of new and existing therapeutic approaches for asthma and for dissemination of laboratory and clinical findings to the health care community.
http://www.acrn.org
Allergen Response Research Center
Conducts Phase II - Phase IV clinical studies. Designed to provide an atmosphere with uniform concentrations of naturally occurring allergens for periods up to 12 hours. Georgia based.
http://allergenresponse.com
Allergome - A Database of Allergenic Molecules
Contains information on allergenic molecules causing allergic diseases like asthma, rhinitis, urticaria, anaphylaxis. Biological and clinical information as well as links to other related web sites are provided.
http://www.allergome.org
UCB Institute of Allergy
Gives health professionals more information about allergy and works with international organisations to promote awareness of allergy as a public health problem.
http://www.theucbinstituteofallergy.ucb.be/
ScienceDaily: Animal Protein Allergies Explained
New research discusses why more people are allergic to cow's milk.
http://www.sciencedaily.com/releases/2007/10/071015081742.htm
