MySpace has announced support for Windows Mobile and Silverlight.
The MySpace application for Windows Mobile will be available on Windows Mobile 6.1 phones in the summer and via Windows Mobile Marketplace for Mobile and on the Web in the fall.
Also an open source kit that can help you create OpenSocial applications using Silverlight to run on the MySpace Open Platform was released. For more information, see MySpace Developer Platform Silverlight.
Michael Scheroetter shows an example including the XAML you can write in a blog post Silverlight for the MySpace Developer Platform.