Bruce Tognazzini has written another great article
expounding his take on the iPhone. The mouse and other pointing devices, Tog reminds us, were around for 20 years before Apple made the technology work in an affordable and accessible manner. Multi-touch gestures are no different, he affirms. "Multi-touch gestural interfaces have been hanging around in the laboratory, screaming for release, for as long as the mouse hung around...Apple didn't invent the concept of the multi-touch interface. They've just, by all evidence, built the first one that, like the Mac before is, is (relatively) inexpensive, attractive, and accessible." He discusses the design from both a hardware and a software perspective.
It's a great column, and I highly recommend that you get a nice cup of coffee and set aside some time to read it, enjoy it and savor it.