These are the implementations made so far for recipe sites which support the hRecipe format for their data:
Add your favorite site by implementing a RecipeParser class with appropriate lxml etree definitions of the getIngredients(), getDirections(), getTags(), and getOtherRecipeLinks() methods.
Few sites implement hRecipe exactly, though, so study the site's html source code to understand its structure. Also see how the current implementations for AllRecipes, Epicurious, FoodNetwork, and Williams Sonoma were written.
Pull requests are welcome!