Awesome idea with the iPhone and iPad, but...
ANDROID and the ANDROID PAD will far exceed the user base of the both the iphone and ipad by the spring. This is not met to start a war
I would strongly advise/suggest - don't pigeonhole yourself and develop for the hot platform today. Think 9-18 months down the road when the iPad will have a minority share in the pad market. Seems unlikely, not really, already the iPhone is being dwarfed by Android installation per week and it's a more open platform.
I understand this is a different development set, but please consider this and don't fall behind the curve. Wait for Christmas time and the only think you are going to hear about is Android Pads. My 2 cents...