If you are interested in developing apps for Windows Phone 7 (available outside the US today, and in the US Nov 8!) then you must go and download Charles Petzold’s entire book Programming Windows Phone 7 along with the sample source code for FREE.

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From the book’s introduction

This book is a gift from the Windows Phone 7 team at Microsoft to the programming community, and I am proud to have been a part of it. Within the pages that follow, I show you the basics of writing applications for Windows Phone 7 using the C# programming language with the Silverlight and XNA 2D frameworks.

Yes, Programming Windows Phone 7 is truly a free download, but for those readers who still love paper—as I certainly do—this book will also be available (for sale) divided into two fully-indexed print editions: Microsoft Silverlight Programming for Windows Phone 7 and Microsoft XNA Framework Programming for Windows Phone 7. [Note from Devon: we should have these ready for order in December 2010.]

More at the MS Press Blog’s announcement…