Mustard & Mustard Seed Recipes: A large index of recipes for mustards, as well as many recipes using mustard as an ingredient.
Mustard and Health: Lots of information on mustard including a selection of recipes.
Mustard Recipes from Recipezaar: A variety of recipes featuring mustard for every course in the Recipezaar collection, as well as links to all recipes which call for different types of mustards.