Yes, it’s closed–and developers still need to get Apple’s blessing before iPad users can install their wares. But, in fact, that’s really a feature–not a detraction. If we seriously want computing appliances to fade into the background and put the focus on what they can do for their users, such safeguards and gating are necessary today.Bill Heyman in his post "The iPad Surfaces!". You know, on a related note, one of the amazing things about the iPad is that an entire iPhone-app's worth of complexity and power can be implemented as a mere pop-up window in a real iPad application. This thing blows the doors off mobile computing.