I am very excited about iPad. It makes multi-touch interaction mainstream. iPad revives and introduces new generation of developers and users to the idea of “direct object manipulation” which is one of the key concepts of Subject-centric computing. ...

If you follow news related to HCI (human-computer interaction), then you probably saw multi-touch interaction demonstrations by Jeff Han. You probably already use (or played) with iPhone or iPod touch. So you know what multi-touch interaction is about. This kind of interface goes hand in hand with Subject-centric computing. Why? ...