Patterns & Practices release Prism version 2
The Patterns & Practices group at Microsoft have just released Prism version 2. I am pretty exited about this because Prism version 2 supports both WPF and Silverlight. And as it makes extensive use of the Model - View - ViewModel amongst other design patterns it is a great place to learn, even if you don't use it as is.
Check out the main "Composite Application Guidance for WPF and Silverlight" page here. Or read Blaine Wastell about it here.