Imagine empowering a person living with diabetes to track their blood-sugar levels throughout the day, report on how they feel at various points (e.g., after meals or exercise) and record how much insulin they took - all from a phone in the palm of their hand.
Watching Netflix on a PS3? No problem. Control it remotely with the iPhone. But perhaps the most awesome connected device is the connected Snow Goggle, featuring a straight-from-SciFi-heads-up display. The connected phone/tablet is here in a way that the connected PC never was.