I attended this session as I'm working in both platforms right now, and expected to learn something. It was disappointing. There main two things mentioned as 'differences', what that in Silverlight you need to go through some hoops to make cross-domain...
Himalia looks very very interesting. It's built with Visual Studio DSL tools. It lets you model a UI based on Use Cases, Navigation Models and Presentation Models. They have an implementation that runs the models on top of WPF but the models are not...