"WPF/E” is the Microsoft solution for delivering rich, cross-platform, interactive experiences including animation, graphics, audio, and video for the Web and beyond. Utilizing a subset of XAML (eXtensible Application Markup Language)-based Windows Presentation Foundation technology, “WPF/E” will enable the creation of content and applications that run within multiple browsers and operating systems (Windows and Macintosh) using Web standards for programmability. Consistent with Web architecture, the XAML markup is programmable using JavaScript and works well with ASP.NET AJAX. Broadly available for customers in the first half of 2007, “WPF/E” experiences will require a lightweight browser plug-in made freely available by Microsoft.

The following are great resources to get started with WPF/E: