Mentioned on The Next Web, it's an app where you can scan in the barcodes of the products you need for your shopping list. It also has a button for daily bargains but doesn't look like that's functional yet.
I don't have an IPhone but it looks promising. Has anyone tried it out?
That does sound pretty good.
It would require a massive product database to link all of those EAN/APN's to the actual products.
With more development like offering alternatives to the products you scanned if they were not available, really has lots of potential.
also,
http://www.grocerygadgets.com/how-grocery-gadgets-work.aspx