There is an OLEDB provider you can use, either in openrowset or in a linked server (or ADO if you're coding outside of TSQL). Have to do it all yourself, nothing I've seen to just pull it all in. AD is a pain to work with from limited experience. Shame they don't offer the option to store it natively in a sql db - MSDE maybe.
Andy
http://www.sqlservercentral.com/columnists/awarren/