If you are wanting to watch this to learn Xamarin, you'd be better off finding another resource. They spend the first 23 minutes (40% of the session) talking about how they came up with the idea of the sample app. Then they only show a tiny bit inside visual studio, but spend the rest talking about the add-ons you can buy (test cloud, insights).
In the spirit of supporting the Coding4Fun community, I don't want the use of the Infragistics controls to impede anyone wanting to play with the code and extending it to do new things.
Infragistics is more than happy to support the community by giving free licenses of the Windows Phone controls to the Coding4Fun readers. Just send an email to email@example.com and say that you'd like the Windows Phone controls so that you can play with the Build 2012 app.