WSJ.com reports: "One of the most important trends in personal technology over the past few years has been the evolution of the humble cellphone into a true handheld computer, a device able to replicate many of the key functions of a laptop. But most of these "smart phones" have had lousy software, confusing user interfaces and clumsy music, video and photo playback. And their designers have struggled to balance screen size, keyboard usability and battery life."
This is the best information that I found on the iPhone so far. It also is the most balance opinion on the product that is not just full of hype or criticism. Read the article for all the details.