We recently used Adobe Edge Animate to prototype and better communicate our idea for an animation within an app that we're designing and building. It worked really well, so we wrote a blog post about it: http://blog.tackmobile.com/article/prototyping-animation/
The working example, Animate project and published source code are available in the post, but here's a link to the example: http://share.tackmobile.com/demos/animation-prototype/ which you can bookmark to the Home Screen on an iPhone.
Video of the prototype is attached.
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