Add a shopping list feature.
The results of the BPO Calc are good to have, but they are not very nice to compile a shopping list from, an automatic functionality for that would be nice. Optimally this shopping list would have the following features:
a) You can publish that shopping list as a link.
b) It optionally only tells you to only buy things that you don't already have in stock at a given location.
c) It works like a shopping cart system in a web store in that it will let you add the results of several BPO Calcs to a cart and then you can create a shopping list of all the Items in your cart.
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http://sisterofeve.ru/shoppingLists/
Check this, also, if you have s-lists, BPO Calc will let you move mats to it :)