This super-long and mostly complicated page from the United States Patent Office apparently proves that Nintendo is working on grocery shopping software for their hand held Nintendo DS gaming platform.
The program would combine a grocery list manager with a store network to streamline your shopping.
The patent and its accompanying illustrations paint the picture of an eventual integrated grocery store network, where your DS connects with the store's network telling you which items on your list you need to grab down each aisle.
Of course, that kind of development is really far away. For now, the patent describes "product lists...tailored to particular stores."
With so many iPhone apps that already have the same sort of functionality, we're not waiting with baited breath on this one. How about you, Unplggd?