Walter Mossberg has spoken - the iPhone is a break through. As I was telling my Judo club last night, you had to somebody like Walter to get your hands on one. Check out his completely thorough review.
At the end, he mentions that the iPhone isn't a good choice for somebody who needs a simple phone, but for those that need high end features, it's a beautiful device. I think there's another user who would benefit : the corporate worker who doesn't need a ruggedized platform. The large iPhone screen and the simple integration with Web 2.0 applications make it the perfect mobile computing platform for many low-impact, yet mobile, jobs.