http://blogs.msdn.com/maximelamure/archive/2009/06/14/guidance-on-differences-between-wpf-and-silverlight.aspxWPF and Silverlight are both XAML based platforms but there are some important functionality and implementation differences between the two. A guidance about these differences was posted on codeplex here: http://wpfslguidance.codeplex.com/en-USCommunityServer 2.1 SP1 (Build: 61025.2)