Samba
From Beakstar Wiki
Tunneling Samba over SSH w/o disabling local file sharing
Edwin Olson wrote a great article on the subject, which I have cached locally.
Regarding this - I've found that the only things necessary regarding the configuration of the loopback interface is that "Client for Microsoft Networks" is installed and disable NetBIOS over TCP/IP is checked (under advanced TCP/IP options).
