After tinkering with Axure, i have be researching about how to do prototypes with WPF and Silverlight and i stumble upon SketchFlow.

This thing has been installed in my pc for months and i don't even know what it is used for >.< One thing i learned in prototyping is that it should be done with minimal effort that you don't have any personal attachment to it when it comes to just throwing it away. SketchFlow lets you do that, and the cool thing is the wireframe you made is base on XAML. This will help you easily port the prototype into a working prototype.

Here are some links to help you get started:

http://www.silverlight-travel.com/blog/2009/07/18/sketchflow-rocks
http://www.silverlightbuzz.com/2009/07/14/using-sketchflow-and-behaviors-for-quick-easy-demos/
http://www.silverlightswitch.com/tutorial/two/tutorial.html