Allergy and Asthma Network - Mothers of Asthmatics, Inc.
The most useful sections here are What are Allergies and Asthma and Research News. Topics include asthma symptoms and triggers.

Asthma Victoria Homepage
WHAT is asthma? WHY do people get asthma? WHAT are the mainsymptoms? WHAT triggers asthma symptoms? CAN asthma be cured? The six step Asthma Action Plan. Adult onset Asthma. Also information on reducing allergens which can cause Asthma in your home - planning your interior and exterior environment and choosing furnishings.

Asthma Management Handbook 1998 - National Asthma Campaign, Australia