This book is interesting for people who want to learn about what goes on under the hood of Windows 2000. The authors' style is clear and easy to understand and there is a good wealth of precious, in depth information.
It would have been even better if more details were included: some system mechanisms are mentioned, but the details are left out (particularly on LPCs). Also, the book is not oriented toward experimenting with the system by means of writing kernel mode code: nearly all of the experiments are based on the usage of tools. I think the book could have had room for something more if a number of pages of data structures listing (returned by Kd commands) were left out, particularly since these listings have very few comments and therefore add very little to what everyone can get from the debugger.

This book explains windows 2000 internal workings in reasonable breadth and sufficient depth. This book is MUCH better than the 2nd Edition of Inside Windows NT, perhaps because of Mark's contributions.
The only problem with this book is that, inspite of being huge, it is only one volume. I think Windows 2000 is too extensive to fit in one book, and though the book is great for getting at many of the principles, you need to look at the DDK/SDK documentation to get more details, and actually use them in your work. At this level the book provides a great starting point to delve into OS internals, but perhaps someone needs to write a book for each chapter to do justice.

As a former systems programmer on Burroughs (Unisys) systems, I was always used to knowing how the OS did things. It is a real treat after working on PCs for so long, to finally get a book that makes it interesting to learn the internals again. This book is full of things that will give you an appreciation of any OS, but the way it cracks into the guts of 2000 is great. The experiments in this book make it really easy to learn how 2000 is organized and apply it to existing programming projects. Learning 2000 from the inside via the debugger is just a great way to do it. No offense to David, but Mark's influence is obvious. If you are a fan of his Internals column, you will like this book even better. The fact that he does it without source code is even more amazing. Wait a minute...why hasn't Microsoft paid these guys whatever they want to build the next version of 2000?
If you appreciate a good OS and an even better manual on it...Buy This Book...