Storyboarding an existing great concept, we software folks adapted it from animation world. I just tried to explain storyboarding in laymen language by giving actual definition and showing the similarity. Just give an idea have done basic Ball animation in Expression blend and created silverlight file.
Silverlight a cross-browser, cross-platform plug-in for delivering the next generation of .NET based media experiences and rich interactive applications for the Web. Silverlight offers a flexible programming model that supports AJAX, VB, C#, Python, and Ruby, and integrates with existing Web applications.