Good Links
WPF MVVM Toolkit
Newly released WPF MVVM Toolkit : http://wpf.codeplex.com/Wiki/View.aspx?title=WPF%20Model-View-ViewModel%20Toolkit (archived copy)
An Advanced MSDN Article explaining the MVVM Pattern: http://msdn.microsoft.com/en-us/magazine/dd419663.aspx
And a Channel 9 Video about MVVM: http://channel9.msdn.com/shows/Continuum/MVVM/