之前写过一篇关于原型设计的blog， 也提到几个设计工具，微软Expression Blend 3提供了一项功能可用作原型设计: SketchFlow
With SketchFlow, you can
a) sketch out ideas
b) turn those ideas into working prototypes that are as rough or as real as you want them to be
c) present those interactive user experiences for review and comment in the SketchFlow player
http://blogs.msdn.com/somasegar/archive/2009/04/25/prototyping-with-sketchflow.aspx
效果示例：