I was looking for an app to add recipes into, and came up with a simple solution...
i just create the recipe in a pages doc, with all the info i want and photos i want, and save it as a pdf file. I then import that into iTunes. When you open iBooks, you can create "collections" which is subcategories of books that you can organize your stuff into. I created one called Recipes. So basically instead of using a separate app, i just go to them in iBooks. It works well enough for me.