Years ago, Macs didn't even acknowledge the presence of Windows networks, which made those LAN wine-and-cheese parties pretty awkward. Now, however, OS X machines are exemplary network citizens, and apparently can even manage Windows workstations under the right circumstances.
TidBITS linked to a roundtable discussion at Cornell University, where Philip Halcomb, of Cornell's Mann Library ITS staff, demonstrated managing user accounts in Active Directory. Now, this wouldn't be very exciting, except for the fact that he was using Mac OS X Workgroup Manager to do it. Sweet.
Phil's part starts at about 7:30. It's a long QuickTime video, too -- almost an hour -- but for IT folks, especially in an education environment, the roundtable series is a must-see.
(Thanks, MHA, for Phillip's name!)