Tracking inventory of groceries in the house and making weekly shopping lists is not a suitable task for a human being. Sure, one can do it, but it's repetitive, boring and inefficient. I want my fridge to do it for me.
If my fridge had a barcode scanner and a touchscreen, I could scan items as I use them or restock them. The fridge could keep track of what I have, what I use, how quickly I use certain items, etc.
When it comes time to make my grocery list, the fridge should be able to tell me what I've run out of by generating a shopping list. I could then download that shopping list into SplashShopper on my Palm Pilot, add any atypical items and go shopping.