Over this past last year I’ve had so many great discussions on SketchFlow, and what an amazing tool it can be for rapidly prototyping and developing ideas. Very recently a co-worker and friend of mine, Sara Summers, completed her book Dynamic Prototyping with SketchFlow in Expression Blend. Sara is a User Experience Evangelists and she is incredibly well versed in the tool. If you’re interested, you can grab the book here on Amazon.
Go Sara!!! ( Now get some sleep. :) )