Designing a rich Internet application RIA can test even an experienced design team. The hardest challenge is to blend Web and desktop paradigms to create a responsive and intuitive experience. Some paradigms that exist in the desktop environment are ill-suited for the Web, while many of the Web paradigms people are familiar with paging, explicit refresh are no longer necessary with RIA technologies like Flex and Ajax. As this space matures, we are learning more and more about which boundaries can be pushed, and which patterns transcend time and technology. While working on the book Designing Web Interfaces, Bill Scott and I explored hundreds of Web applications searching for these patterns. Armed with a crazy amount of examples, we distilled the patterns into six principles:

via Rich Internet Application Screen Design | UX Magazine.