I found this talk on Design Prototyping by Dan Harrelson of Adaptive Path that was given at the MIX ’09 conference. For those who don’t know what MIX is, it is a Microsoft sponsored conference (basically the MS version of Adobe’s MAX).
Here is the summary of the talk:
See how “design prototyping” differs from other techniques, and learn how to determine when a prototype is needed. Understand how to tailor your prototype to a particular audience, gather techniques for bringing paper sketches to life, and how interactive sketching can fit in an Agile process.
Now you don’t not need to install Silverlight to view the video, there is Mp4 version available.