The press embargo has lifted on early reviews of the iPad. Here's Andy Ihnatko.
Andy says several times that with the iPad, Apple has re-thought computing "from scratch." One of the reasons why I'm hopeful the iPad will be successful (and it sounds like it is) is that it isn't quite from scratch: Apple has been making iPhones for a couple of years now. Much had to be invented anew for the iPad, sure, but Apple has had time to gain experience with touch interfaces. The iPad builds upon ideas of the iPhone.