If that isn't enough, the last part of the book shows how to roll your own scripts for adding users, querying the Active Directory etc.. Or as I prefer to think of it, repetitive tasks that you don't really want to go near the gui for. I have this book down as having 585 pages of solid fact, no filler, all examples kept short and focussing on the point in question.
This is an example of how technical books should be written - lots of hard fact with unambigous examples in a well-written style. If you have to go near Windows 2000 & the Active Directory (and I suspect one or two people may be in this position) then buy this book.
In addition to being up-to-date, you'll get some information in this book that you'll be hard-pressed to find in any other places. The most obvious example of this is the extensive coverage given to the Active Directory Services Interface (ADSI).
O'Reilly's Active Directory book should be made mandatory reading for anyone before deploying Windows 2000 and Active Directory. Put this one on your short list of "Must Reads" for W2K.