Xamarin is an interesting company with an interesting product. Their vision is to use C# to write code for all mobile platforms, including iOS and Android. Windows Phone you get for free!
I talk with Bryan Costanich from Xamarin about this product. It will be a deep dive into Mono, user interface design and much more.
Xamarin intro presentation – http://www.slideshare.net/bryancostanich/c-rocks
Download – http://xamarin.com/download
Docs site: http://docs.xamarin.com/
Getting started with Xamarin.iOS Webinar – http://docs.xamarin.com/videos/ios/getting-started-using-monotouch
Getting started with Xamarin.Android Webinar –http://docs.xamarin.com/videos/android/getting-started-using-monoforandroid