The best reference is still Microsoft's - "Microsoft Windows 2000 Scripting Guide - Automating System Administration". It covers VBScript, WSH, ADSI, ADO, and WMI. This text is available online at http://www.microsoft.com/resources/documentation/windows/2000/server/scriptguide/en-us/sagsas_overview.mspx

Other references:

"Windows Script Host", by Tim Hill. New Rider Publishing

"Windows NT/2000 - ADSI Scripting for System Administration", by Thomas Eck. Macmillan Publishing USA

"Windows Scripting Secrets", by Tobias Weltner. Hungry Minds, Inc.

"Active Directory Cookbook for Windows Server 2003 and Windows 2000", by Robbie Allen. O'Reilly & Associates

"VBScript in a Nutshell: A Desktop Quick Reference", by Paul Lomax, Matt Childs, Ron Petrusha. O'Reilly & Associates

"Windows 2000 Scripting Bible", by William Robert Stanek. Hungry Minds, Inc.

"Windows NT Scripting Administrator's Guide", by William R. Stane, William Robert Stanek. Hungry Minds, Inc.

"SAMS Teach Yourself Windows Script Host in 21 Days", by Thomas Fredell, Michael Morrison, Stephen Campell, Ian Morrish, Charles Williams. SAMS

"Scripting Windows 2000", by Jeffrey Honeyman. McGraw-Hill Professional Publishing

"ADSI ASP Programmer's Reference", by Steven Hahn. Wrox Press Inc.

"Managing Enterprise Systems with the Windows Script Host", by Stein Borge. Apress

"Inside Microsoft Visual Basic Scripting Edition", by Scot Hillier. Microsoft Press

"Microsoft Windows Script Host 2.0 Developer's Guide", by Gunter Born. Microsoft Press

"Microsoft Windows 2000 Active Directory Programming", by Charles Oppermann. Microsoft Press