Some of the scenarios for Flash and Silverlight usage are similar, such as rich media/video within websites, or interactive rich content for e-commerce, e-learning, or advertising. As interactive designers, you may want to reuse and repurpose the Flash assets that you built before. Here is a SWF to XAML converter called "The Converted" created by Debreuil Digital Works, a Canadian company. You can see a list of demos they've converted to XAML from SWF. Electric Rain also announced a project called Harmony that converts SWF based Flash files into Silverlight based XAML files. Stay tuned!