Those of you that have used apple products in the last several years will agree that they have continuously impressed the market with their innovative ideas around user experience. Whether its the multi-touch iphone screen, or the expose features of OS X, you can see/feel the difference in the experience.

Now they are sharing some of their thoughts with us. Developers are now able to develop for the iPhone, and to further enable them to create great apps, apple is sharing their Approach to Human Interaction. This document contains Human Interaction Guidelines, and even though they are particular to the iPhone, they are VERY much applicable across every electronic experience, be it phone, desktop, web, kiosk, etc.

Have look, and learn something!
(ps: There is also a link to the pdf version on the top left of the page)
http://developer.apple.com/documentation/iPhone/Conceptual/iPhoneHIG/Introduction/chapter_1_section_1.html#//apple_ref/doc/uid/TP40006596-CH1-SW1