http://wp7sketchflow.codeplex.com/

The SketchFlow Template for Windows Phone 7 adds a new SketchFlow template for Expression Blend* users that makes creating a prototype of a Windows Phone app quick and easy.

* Please note: To use the SketchFlow Template for Windows Phone 7 you need to be using Blend 4 with SketchFlow enabled (this is the version of Blend that comes with both Expression Studio 4 Ultimate and Visual Studio 2010 Ultimate) you also need to have the Mango developer tools for Windows Phone installed.

 

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Awesome stuff!