The official release of Silverlight 3 and Expression Studio 3 was last Friday and I’m really excited about how these products have been evolving. My favorite new feature is Sketch Flow, which I’ve been playing around with for a little while now and have found it to be a great way to build dynamic prototypes.  From my previous post on Wireframe Prototype Fidelity I would have added a bit on Sketch Flow if the product had existed at the time.  I think it fits a gap in the tools of the UX professional who works on rich interactive applications.  For myself I was either building static images in OmniGraffle or Adobe Illustrator or I was mocking things up in HTML with JavaScript.  Sometimes I’ve built stuff using Flash or even modeling and rendering an animation in 3D tools like Maya to best get the concept across. I think Sketch Flow really brings it all together for a quick way to rough out the experience. My favorite part is how Sketch Flow lets you put in fake data driven content. It’s hard to explain how awesome this is, to get a good understanding check out the video below.

Check out this great video introduction to using Sketch Flow from Mix earlier this year:

To keep up to date be sure to follow the Silverlight team blog, Soma’s blog and Scott Guthrie’s blog