Why they could do such a cool user interface?

Of course, I am also one of fans for small gadgets;) I took a look at some pictures on the following link and immediately I found what small gadgets UI should be. I knew that some people had been trying this kind of UI, but they didn't succeed. I am really amazed at the fact that Apple could do that and they knew what it should be....it's exactly "think different"

http://www.engadget.com/2007/01/09/live-from-macworld-2007-steve-jobs-keynote/

Ported Mac OS X on iPhone?

http://www.linuxdevices.com/news/NS7732079254.html