Here's the start of a series of articles in Microsoft's Technet by Mark Russinovitch - Windows Administration: Inside the Windows Vista Kernel: Part 1 -- TechNet Magazine, February 2007. Mark is and acknowledged Windows expert and the co-founder of Winternals Software and Sysinternals which was purchased by MS last summer. Both he and his partner Bryce Cogswell now work for Microsoft.

Note: This article is very good and definitely for the technically inclined.