out side of spark, there are a few great sites and one of them is the ADA site itself for recipes for diabetics another is Diabetic Living magazine have 100s of great diabetic recipes for all levels of diabetes (from those doing low carb to those trying to louse weight and everything in between).
You can actually buy the Diabetic Living magazine in many places I know safeway tends to have the bi monthly issues of it in stock most of the year as does walmart and most magazine places as well. Diabetic Forcase is the ADAs publication and harder to find in general (less you subscribe to it though the ADA site) but again its full of recipes that are great and tasty.
ADA Recipes = www.diabetes.org/food-and-fitness/food/rec
Diabetic Living Magazine Recipes = www.diabeticlivingonline.com/diabetic-reci