Dozens of texts are going to be published on this complex and core topic for Windows 2000 and Windows 2003. Please let me know which texts you find useful and which NOT.

Microsoft's Technical Reference and Notes from the Field are excellent resources:

based on actual implementations - real world

another excellent cookbook with step-by-step solutions to problems you will have with Windows 2000 and Windows 2003 AD

not a beginners book, check the title - worth the $$ if you are working in AD

focus seems to be manager level, lots of what is, less, how to - not for the techie

an excellent text - well written