Axure RP http://www.axure.com/ http://www.axure.com/ also generates some pretty sexy HTML prototypes ... all completely self contained and renderable in any bro

Axure RP http://www.axure.com/ http://www.axure.com/ also generates some pretty sexy HTML prototypes ... all completely self contained and renderable in any browser. Has helped make every app I've ever done for a client involving it, go really smoothly.