Mugen MVVM Toolkit makes it easier to develop Silverlight, WPF, WinRT and WP applications using the Model-View-ViewModel design pattern. The purpose of the toolkit is to provide a simple framework and set of tools for getting up to speed quickly with applications based on the MVVM design pattern. The core of Toolkit contains a navigation system, windows management system, models, validation, etc. Mugen MVVM Toolkit contains all the MVVM classes such as ViewModelBase, RelayCommand, services, etc.
The best way to get started is to download and open the samples and see how it is easy to create applications using MVVM pattern.
I plan to put out additional blog posts and write a documentation on using the Mugen MVVM Toolkit and exploring different features.