http://www.apple.com/iphone/iphone-3gs/accessibility.html
In addition to Voice Control, iPhone 3GS features VoiceOver, the world's first gesture-based screen reader. Instead of memorizing keyboard commands or pressing tiny arrow keys, you simply touch the screen to hear a description of the item under your finger, then double-tap, drag, or flick to control iPhone. VoiceOver speaks 21 languages and works with all of the applications built into iPhone 3GS.This is really something. I'd be interested in hearing our own accessibility experts' take on the features shown in the video.
Response by Christian Vinten-Johansen can be found here.