I have started learning about Windows 8 Store Apps.
I recall from Silverlight and WPF programming earlier that people adapted the MVVM concept and now I am not sure if
MVVM is not dead in Windows 8 Metro apps.
We didn't use MvvmLight in our app, but the basic components you need, like binding to ViewModel properties, using ICommands in the ViewModel and INotifyPropertyChanged are all available with very minor changes (if any).
Microsoft published a nice sample recently. It doesn't say MVVM explicitly, but it has what you need to get started. And Josh Smith's article is of course still useful.