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.