Look here, a screenshot of ADUC running on Windows XP...
...at first sight, nothing special. Except that ADUC is connected to Samba 4 running as an Active Directory domain controller.
Samba 4 is not yet ready for production, but it is getting close.
Many thanks to Ks for his Samba 4 live CD.
And many thanks to the Samba team for this nice free software.