Dynamic Prototyping with SketchFlow in Expression Blend is a book coming out in late 2009 through Que Publishing and is being written by Chris Bernard and Sara Summers. It will teach you everything you need to know to create rich and dynamic prototypes using SketchFlow in Expression Blend. The book site includes updates about the progress on the book and a preview chapter and the associated projects that go along with it. The preview chapter will teach you all the basics you need to know to begin using SketchFlow features in Expression Blend.