If technologies such as AJAX and Flash are powerful flames heating up the Web, then we designers are the glassblowers. It's up to us to create intuitive, engaging interfaces on top of the new possibilities that AJAX and Flash bring. But old skills aren't enough in this age of animated transitions, asynchronous interactivity, and application-like behavior. What does every designer need to know in order to move from static HTML sites to dynamic rich interfaces? This presentation covers effective ways to incorporate user feedback into a dynamic interface, and how timing can be the difference between an interface that works and one that doesn't. We'll also discuss how traditional usability ideals such as discoverability and simplicity take on new meaning when we design rich interfaces. The session will include many examples of successful and failed rich interfaces. Presentation by Steve Mulder.