Due to popular demand, I have added support for both WPF 4 and Windows Phone 7. Come and get it!
The source code now has three distinct projects: Silverlight (change set 5531), Windows Phone 7 (change set 5532), and WPF (change set 5533). The Silverlight version is the main one, and the other two depend on it. There are also sample apps for WP7 and WPF included in the download zip file.