Its an excellent question. Aside from the points already mentioned, the app store for the iPhone conveniently hooks into the payment scheme you have for the ph

Its an excellent question. Aside from the points already mentioned, the app store for the iPhone conveniently hooks into the payment scheme you have for the phone. No need to fool around with credit card numbers, trust issues, etc. (Basing this on the iTunes store would be a good idea with many of the same advantages.)