Guidelines for Apple iPhone developers

Apple has released its developer’s guide for its remarkable product, iPhone. Users or developers can refer to the Apple’s Developer guideline (called “Apple Developer Connection”) to create their optimal website or application that can be used on Apple’s extraordinary product, the Apple iPhone.
Apple's Guidelines says Safari on iPhone uses the same Web Kit engine as Safari on the computer desktop. With the Safari Web Kit engine, you can develop sophisticated Web 2.0 sites and applications that will impress and delight iPhone users. To design a web application that shines on iPhone and ensures a great user experience, you’ll want to:

• Understand the capabilities of iPhone.
• Follow established design practices for the web.
• Adopt iPhone-specific design principles.

The guidelines will help to prepare web content and design a website or web-based application for iPhone

Apple guidelines :
http://developer.apple.com/iphone/designingcontent.html