The incomparable Brad Suinn from Apple has been kind enough to release juicy tidbits about the AppleShare X Client in a unauthorized readme. Amongst other things the end of the file shows how to do an AFP/IP connection using SSH so everything is nice and secure and encrypted. Check out:
http://homepage.mac.com/suinn/AShareXDevNotes.html (search on "SSH" to find the relevant section)
[Editor's note: You may also want to check out Brad's home page for some other interesting items]
Mac OS X Hints
http://hints.macworld.com/article.php?story=2001052910385397