I attended TechED USA this year. One of the key technologies that has a lot of buzz in the ITPro space is about Powershell. I attended a few sessions on Powershell and the Exchange Management Shell (Powershell for managing Exchange 2007). I found a free Powershell book online.
Other Powershell information.
Quest Software has free AD powershell stuff
AD templates for controlling the powershell execution policy.
Search for Powershell