I suppose a camera in a fridge would be handy, so you could have a peek at whether you were out of milk.

I believe there was a similar product, but you had to swipe product barcodes, to maintain a database. But I'm not the kind of person who keeps a database of the contents of my fridge, which might be why I'm the kind of person who forgets to buy milk.

My heuristic for coming up with that idea - when's the last time I called home, and ask someone to perform a simple task. Pet food dispensers might be another one. I guess a remote kill switch for irons, ovens, etc could be useful.