WPF has changed the way we design & develop our applications. Prior to WPF it was not that easy to change the look of the application. WPF gives the power of designing simple yet powerful applications which are user friendly. Visual Studio 2010 is a great tool for developing WPF applications, but Microsoft Expression Blend gives you the precise design control over the interface of your application. It is also great to see how Blend has progressed to the current version.