This document provides an overview and summary of Windows Phone 7 development. It discusses what Windows Phone 7 is, the development tools and frameworks available, how to market an application, and resources for developers. The key points are: Windows Phone 7 is Microsoft's mobile OS focused on the consumer market; development can be done using Silverlight and XNA; tools include Visual Studio, Expression Blend, and the Windows Phone SDK; applications are marketed through the Windows Phone Marketplace.