There are many good vbscript books out there.
For beginners, this is probably one of the best ones (IMO):
<a href=”http://www.amazon.com/Microsoft-VBScript-Programming-Absolute-Beginner/dp/1598638033/ref=sr_1_1?s=books&ie=UTF8&qid=1289246979&sr=1-1#_”>Microsoft WSH and VBScript Programming for the Absolute Beginner – Jr Jerry Lee Ford </a>
However, I think it doesn’t include more advanced topics such as the Active Directory Services Interface (ADSI), which would be useful for administrators. You might want to google for a book that covers ADSI and WMI, but make sure it includes any new features introduced with Windows server 2008.