Great article, I agree with it all but would like to add one more item to that list.

I feel there should be some native sharing mechanism between the i-Phone and i-Pad, that is to say beyond cloud or file sharing. The i-Phone, besides being a phone, can evolve into a data and sensor collections device, the two devices should form a symbiotic relationship. To cite current technology the GPS could share data via Bluetooth, I can for see possibilities of other sensors being available in the i-Phone as technology improves such as temperature, humidity, altitude, to name a few (the list can go on). The stage has been set with the availability of the two versions of the i-Pad, if you own both devices it would make sense economically to get the best bang for your buck. One may then choose the i-Pad with larger storage over a 3G option knowing connectivity will be via the i-Phone. The point is to go beyond just tethering the two devices (which I know Apple is not planning on doing) but in spirit of Apples "it just works" It just seems like a natural step.