I'm going to be speaking at the next meeting of the Boston Area Windows Server User Group at the Microsoft campus in Waltham (May 4th @ 7pm).  My presentation is called Active Directory Hacks.  I presented something similar at a Windows Connections conference and it received high marks.  I also plan on giving away few books.  Typically, I come up with some interesting trivia or obscure questions to ask the crowd.  First person to answer correctly gets a book.