AllAllergy.Net http://allallergy.net/
A gateway to all allergy, asthma, food allergy, eczema and intolerance conditions on the Web. Includes an allergen, preservative and additive database.
IsItAllergy.com http://www.isitallergy.com
Designed to provide both physicians and consumers with information concerning identification of causal agents of allergy-like symptoms associated with recurrent upper respiratory disease, allergies, and atopic components related to common childhood conditions.
Online Allergy Center http://www.onlineallergycenter.com
Devotes itself to discovering the cause of allergy and allergy related disorders. Once the causes have been determined, treatment involves prevention of the condition.