Information about the Portable Library Tools:
By moving the ViewModel into a Portable Library Tools project I have to compile the ViewModels only one time and I can reuse them for WPF, Silverlight, WP7, (Xbox 360?).
The limitation is, that I have to write my own "MVVM Light Toolkit" for the ViewModels.
Are there any plans to support the Portable Library Tools in the future?