Windows Server 2008 ServerManagerCMD: Scott Lowe from TechRepublic as written a great article on the Windows Server 2008 command prompt being extended with the new Windows Server 2008 command line tool ServerManagerCMD

In short ServerManagerCMD can be used to query install and remove Windows Server 2008 features and roles from the command line instead of via the traditional Server Manager, the TechRepublic article can be found here Install Windows Server 2008 Features with ServerManagerCMD