iPAD's features
Browsing
The Safari browser on the Apple iPad is just as capable as the iPhone browser. Steve Jobs pitches it as a way to see the full page you're surfing on without zooming in and out, something you can obviously not do on the iPhone. There's of course also landscape and portrait mode support, and the built-in accelerometer will take care of the switching for you.
That being said, Apple is known to be a strong supporter of HTML5, and there's no doubt that the Apple iPad is part of the company's effort to get Web developers moving in the right direction in that regard. There's no Flash or Silverlight support at the time of writing here.