I came across an excellent post by Tim, Silverlight resources for Flash developers , where he provides links to two new resources which could be very helpful for Flash developers wanting to learn Silverlight.
The first is the Project Rosetta, a site dedicated to helping designers and developers build applications in Silverlight while taking advantage of skills they already know. As it explores visual programming in Silverlight by providing various lessons, and uses Flash techniques as a common ground and reference. Channel9 also provides a video on Project Rosetta where it caught up with Rick Barraza, the author of the first article From Flash to Silverlight.
The other resource is called Shine Draw from Terence Tsang. It's a blog which focuses on comparing both Flash and Silverlight with various kind of samples and source code.
So check out these cool resources which will help you to learn and shift to Silverlight.