Here is the Microsoft PressPass article that sums it up. Developers who weren't in the Early Adoption Program for Silverlight 3 can now use Sketchflow for the first time in Expression Blend 3 RC. It is really very exciting news. The projects I work on at the moment don't really require use of SketchFlow. But I'm hoping we get some bigger projects down the road to be able to use it as a team. That would be fun fun fun!!