SurfaceWPFApp is a project mainly written in C#, it's free.
WPF application for ms surface
Capgemini Interactive Project Portfolio
Capgemini Interactive Project Portfolio: The application gives the interactive presentation of Capgemini's and customers' projects and engagements within the Oil & Gas sector. With the help of the application you can easily get an overview and go into details about each project. Developed with Visual Studio 2010 and Expression Blend 4 using 3.5 .NET Framework and Surface SDK.
More info: Behance Youtube preview