On November 30, 2010 I did a presentation on "MVVM for Silverlight 4" at the Sacramento .Net User Group:

Title: Introduction to using the MVVM pattern with Silverlight

Description: Introduction to Silverlight programming using the Model-View-ViewModel (MVVM) pattern for line-of-business applications. MVVM can make Silverlight applications more resilient when changes occur, more unit testable and make it easier for coders and UI-designers to work in parallel.

Thumbnails for two of my main slides:

Slide: Architecture diagram
Conventional code-behind vs. MVVM.

Slide: MVVM, WCF-RIAS, Line-of-business demo app.
I start it as a conventional app and convert it to MVVM.

The whole PowerPoint deck.

This is the source code (VS2010 SL4 solution) for the demo application used during the presentation.  The app is a simple Silverlight 4 line-of-business app that uses WCF RIA Services, Entity Framework 4 and Sql Server.  I take the app through three steps.  First I build it using the standard conventional, non-MVVM code-behind pattern with a DomainDataSource.  Second I convert it to use the MVVM pattern with the ViewModel containing the WCF-RIAS DomainContext and a PagedCollectionView.  Finally I add unit and integration tests to the MVVM-ized app using a Silverlight-Unit-Test-Framework project.