All they needed to do with this was implement a sim tray system compatible with the iPhone for hot swapping. Suddenly you've got every iPhone owner actually seeing a use for the damn thing outside of their home wireless. But no, too easy. Why do something sensible when you can just incorporate something semi-proprietary just to be different and extort your customers a little more. Mini displayport anyone?
More like they should have implemented a system where by the iPhone can share its 3G connection with the iPad, using USB, Bluetooth or WiFi.