Here is some info on the recording of the webinar that I did last week for AppDev regarding the Xamarin Designer for Android.

Basic Info: Android user interfaces can be created declaratively by using XML files, or programmatically in code. The Xamarin Android Designer allows developers to create and modify declarative layouts visually, without having to deal with the tedium of hand-editing XML files. The designer also provides real-time feedback, which lets the developer validate changes without having to redeploy the application in order to test a design. This can speed up UI development in Android tremendously. In this webinar, we'll take a look at UI Design in Mono for Android, the basics of the Xamarin Android Designer, and build a simple application with the designer.

Here is the link:

http://media.appdev.com/EDGE/LL/livelearn05232012.wmv

I think it will only play in Internet Explorer.  Enjoy!