Contrasting Silverlight and WPF
Composite Application Guidance for WPF and Silverlight
Silverlight and Windows Presentation Foundation (WPF) both allow you to develop rich user experience applications based on XAML and the .NET Framework. However, there are some differences between these platforms, and these differences have to be carefully considered when transitioning an application between Silverlight and WPF or when building an application that targets both WPF and Silverlight.
Silverlight and WPF Architectural Overview
Windows Presentation Foundation (WPF) provides developers with a unified programming model for building rich Windows Forms applications that incorporate user interface (UI), media, and documents. WPF enables software developers to deliver a new level of “user experience” (UX) by providing a declarative-based language (XAML) for specifying vector-based graphics that can scale and take advantage of hardware acceleration. more here
