Windows Internals 5th Edition was released to the presses today. If you've ever been curious of the low level details of Windows you'll want to check this book out. It should be about 70 USD when it goes on sale. Here's a description of the book:
Get the architectural perspectives and inside details you need to understand the Windows kernel!
Delve inside the Windows kernel with noted internals experts Mark Russinovich and David Solomon, in collaboration with Alex Ionescu and the Microsoft Windows product development team. This classic guide—fully updated for Windows Vista and Windows Server 2008, including 64-bit extensions—describes the architecture and internals of the Windows operating system. You’ll find hands-on experiments you can use to experience Windows internal behavior first hand, along with advanced troubleshooting information to help you keep your systems running smoothly and efficiently. Whether you’re a developer or a system administrator, you’ll find critical architectural insights that you can quickly apply for better design, debugging, performance, and support.