This news made my week! My favorite cross-platform framework(Xamarin) and my favorite MVVM framework(Caliburn.Micro) are finally coming together. The team after Caliburn.Micro announced that they have a working port of Caliburn for Xamarin.
Not everything is ported yet, but I expect that some of the platform specific features will be ported as well.
A working sample can be found here: nigel-sampson/xamarin-experiements.