WPF Apps With The Model-View-ViewModel Design Pattern

http://msdn.microsoft.com/en-us/magazine/dd419663.aspx

written by Josh Smith. He has written lots of articles on WPF.

You can view them at his blog joshsmithonwpf.wordpress.com

 

 

Writing More Efficient ItemsControls

http://msdn.microsoft.com/en-us/magazine/dd483292.aspx

from Charles Petzold