In this article Tyson Damman talks about the design side of Silverlight.
Silverlight is a formidable option for delivering rich web content. There are some obvious flaws still, but for a program in its earlier stages, It has some pretty muscular legs. I would love to see some more exploration into making this a more powerful design tool with options for transparent video and blending modes, a much stronger typography engine, and options for guides and guide layers.
The first part of this article can be found here.