I have recently been looking closer into cross-platform development and found myself rooted in Xamarin. The first adventure is Xamarin.Android and porting Bookqueue to the Android environment. Microsoft has made accessing SkyDrive simple with its LiveSDK for Android. To help make the native java libraries available to .NET, Xamarin has provided a nice Android Java Binding library that allows creation of runtime callable wrappers.
My first dive into this adventure went pretty smooth and is available at GitHub – LiveSDK.Android