Autism Network for Dietary Intervention (ANDI)    
Includes studies in this area and a list of volunteers experienced with dietary intervention.  ANDI also offers information in 9 different languages, including Spanish.

Newdiets.com   
Gluten free/casein free (GF/CF) recipes.

Allergen free shopping    
A comprehensive list of products and recipes, including gluten free, casein free, wheat free, soy free, egg and dairy free, etc.