Dietary Card
Your allergy or food preference printed on credit card sized plastic, ready to hand to a waiter or chef. The card costs US$7.
http://www.dietarycard.com/

Food and Drug Administration
A discussion of food allergies that includes common symptoms of an allergic reaction.
http://www.fda.gov/fdac/features/2001/401_food.html

Food and Nutrition Information Center
Food allergy links.
http://www.nal.usda.gov/fnic/pubs/bibs/gen/allergy.htm

PeanutAllergy.com
An online resource for peanut allergy sufferers.
http://www.peanutallergy.com/

The Food Allergy and Anaphylaxis Alliance
An alliance of food allergy organizations around the globe.
http://www.foodallergyalliance.org/

The Food Allergy and Anaphylaxis Network
Food allergy resource.
http://www.foodallergy.org/

The Henna Page
The dangers of an allergic reaction to black henna detailed.
http://www.hennapage.com/henna/ppd/printout.html