Microsoft Active Directory Developer's Reference Library

The reference information in this library is very useful and complete, but I was pleasantly surprised to see how much hands-on development information is provided as well. Since Microsoft's Active Directory is relatively new, I needed the combination of guides + reference to get up to speed with AD programming/scripting. This library provided both. The schema book, with its chapters on extending the schema and complete class/attribute listing, rounded out this reference as a must-have for people programming or scripting Active Directory. The AD glossary is a plus, too.