Quick Intro to MVVM A small introduction
Getting Started with the MVVM Pattern in Silverlight Applications
MVVM Light Toolkit
Download it here - There is a couple of videos here as well!
Chapter 5: Implementing the MVVM Pattern
Chapter 6: Advanced MVVM Scenarios - Most introductions only explain the topic in a basic way which does not occur in reality. Here, they show how to deal with the tricksey areas
Simplifying commands in MVVM and WPF - I like the adapted approach proffered by David N. in the comments
Using the BackgroundWorker in a Silverlight MVVM Application - Most of my apps have background worker threads or threading in some manner.
WPF MVVM Commands - new reduced-boilerplate recipe - Not so keen on this approach