I was searching for filter driver doucmentations in microsoft Windows Hardware Developer Central site, and I was surprised to find many interesting information about Windows Vista System Internals.

http://www.microsoft.com/whdc/system/vista/default.mspx

For example:

Changes to User Mode Services in Windows Vista

 

Impact of Session 0 Isolation on Services and Drivers in Windows Vista

 

Kernel Enhancements for Windows Vista and Windows Server Longhorn

 

Protected Processes in Windows Vista