MVVM Light Toolkit

Building the code

In order to get the latest source code from the Source Code section, build it, unit test it, and get the latest DLLs installed, check this article:
http://www.galasoft.ch/mvvm/building/

Installing the binaries with NuGet

You can add MVVM Light to an existing Windows Presentation Foundation (3.5 or 4), Silverlight (3 or 4) or to a Windows Phone (7 or 7.1 beta) project with the help of the NuGet package manager. For more information, visit http://blog.galasoft.ch/archive/2011/05/07/mvvm-light-v3-on-nuget-now-with-wp7-support.aspx

Installing the full toolkit (binaries, templates, snippets)

Right now the installation process is still manual as described at http://www.galasoft.ch/mvvm/installing/manually/. This will change soon with an automated installer.

Creating your first application

To create an application in Visual Studio: http://www.galasoft.ch/mvvm/creating/.
To create an application in Blend: http://www.galasoft.ch/mvvm/creatingblend/

Understanding MVVM

To start with MVVM and understand the basics, see my MIX10 session, available in video at http://live.visitmix.com/Archive#VideoList (scroll down to EX14). A slightly longer version (including a Windows Phone 7 demo) is available at http://channel9.msdn.com/posts/kreekman/TechDays-2010-Understanding-the-Model-View-ViewModel-pattern/

A Deep Dive session is going to take place at MIX11 (April 2011), stay tuned for more information.

Getting started with MVVM Light Toolkit

A good "primer" series by Jesse Liberty: http://jesseliberty.com/2011/01/04/wpfs-mvvm-light-toolkit-soup-to-nuts-part-i/
Another nice series by Chris Koenig, using MVVM Light: http://chriskoenig.net/category/development/mvvm/

More articles

There are a lot of articles written about the MVVM Light Toolkit: Info about new versions, documentation about specific components of MVVM Light, etc.
For more information, please check http://www.galasoft.ch/mvvm/#tutorials