These quickstarts provide guidance on migrating a Windows Phone 7 app to perform well on Windows 8 devices.
We will assume that you are a developer familiar with Silverlight for Windows Phone but wish to get up to speed on Windows 8 application development, and the challenges and solutions that may arise during your porting effort.
We will be migrating the Khan Academy Windows Phone 7 app developed by Joel Martinez. The original source code for the phone app is here
The finished Windows 8 solution is also available for download