Sparkle vid on channel 9
Via Paschal, a demo by Manuel Clement who shows off the tool from a designers point of view and the designer-to-developer work flow aspects. This aspect is vital in media teams, by they web or other media (digital TV, devices etc) and that aspect will cross over far more into software development with Avalon. So with Sparkle you have your designer do what they do best and creating some kick ass Avalon stuff. Your developers can then take the XAML files and do what they do best and start coding. Notice that its one tool for designers and one tool for developers, each is great at what it does but you don't loose the feel of workflow nor one tool trying to do too much.
People have been asking how I had seen Sparkle, I am a member of the Microsoft CAB (Customer Advisory Board) for the product, all those years around Generator and Flash. I have added a new Sparkle category, I will saying a lot more about Sparkle over time so your welcome to keep a watch.
Manuel is a strong voice in the design market and has a number of books in the Flash space, someone with such a strong understanding of designers will really show in Sparkle.