ADWS

Replacing DMT ED with an AD based DMT, then ADWS might be of interest.
http://technet.microsoft.com/en-us/library/dd391908(WS.10).aspx

An ADWS overview and supported web service protocols
http://blogs.msdn.com/adpowershell/archive/2009/04/06/active-directory-web-services-overview.aspx

ADWS is a native option in Windows 2008 R2, it is also available as a download to allow the same usablility on older OSes like Windows 2008 SP1 and Windows 2003 SP2. http://support.microsoft.com/?scid=969041

Here's the AD Powershell blog...lotsa of great info here on managing AD from Powershell. BTW- The AD Powershell module connects to ADWS, so ADWS needs to be up and running to take advantage of the nifty features.
http://blogs.msdn.com/adpowershell/default.aspx