There is always FTP. The OS X finder can mount an FTP connection and
show it in the finder the same as if it was SMB or AFP.
Do it by Cmd+K, then key in the URL (ftp://your.server.here). You can
make this part of startup using NetInfo (it's been a long time, I
forget exactly how).
This is probably about as secure as your Samba option above though.
Finder can read FTP mounts fine, but writing is extremely buggy, if
it works at all.
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