Are there any others? What can the Server version do that the
Client version is simply incapable of accomplishing at this time?
Actually, OS X supports ACLs just as well as OS X Server - there's
jsut no gui for it. You'll need to use fsaclctl to enable ACL
support on a given volume, and then chmod to set the permissions.
There's a GUI for ACL's, it's just not the Apple supplied Workgroup
Manager.