This book is the best book I've seen for developing Windows CE systems. Notice I said systems not applications. While other books talk about how to develop applications for WinCE systems this talk about actually how to build the kernel and other configurations. I use this book frequently to look up information regarding CE. It also provides good coverage of topics for application development and COM & MFC framework. This book needs a new revision to keep up with the changes in the 3.0 version, however.