Hope it works out, I've wanted something like this too (but not enough to pay for it). An issue I wish could be resolved is too much reliance on any particular recipe. My two-minutes-with-this observations are that it's nice that some recipes seem to have 'one of these' so it can work with substitutes but how about outright removals? Do I really need that dash of nutmeg, and if I don't have the nutmeg, will that recipe just not show up? Seems like this interface could almost get there with another category besides 'on hand' and 'all' called 'almost'. It would fit in well with the add-to-shopping-cart feature too.

Also wish more places used the recipe format that Cooking For Engineers uses... e.g. http://www.cookingforengineers.com/recipe/170/Chinese-Almond...