(NSFW) What the "F" Should I Make for Dinner? A website that auto-generates recipes - don't like it, try another - or pick vegetarian!
*CookThink: What are you craving? *my favorite
*RecipeKey: Find Recipes based on the Ingredients in your Pantry
*Supercook: Another recipe search engine that lets you search by ingredients you have at home.
From RedTricycle: Prepared Dinners, Seattle: Best Services for Making Dinnertime a Piece of Cake.