101 Windows Phone 7 Apps Volume 1 is cool book

http://www.amazon.com/101-Windows-Phone-Apps-Developing/dp/0672335522/ref=sr_1_1?ie=UTF8&qid=1323537156&sr=8-1

My best suggestion is reading this book if you have interested in developing Windows Phone Application.

• Good points of this book

The best point of this book is a lot of tutorials are inside. You can learn step by step with building apps. The level of difficulty is up according from 1 to 50 samples.

• Target of this book

You had better know xaml before you read this book. But you don't need to know whole sliverlight or WPF technology. Just glance basis of xaml.