Dev07 - Monetizing a Windows Phone 7.5 Application

Building Games for Windows Phone 7.5 with Farseer Physics Engine
by Ian Qvist, project manager of Farseer Physics Engine
Get the slides and demo code from Ian's blog here:
http://ianqvist.blogspot.com/2011/12/xna-and-farseer-physics-engine-33.html
Get more samples and the framework at codeplex!
http://farseerphysics.codeplex.com/