This may have been obvious, but I just discovered it recently ... if you'd like to SSH to a host computer, and you know its Rendezvous name but not its IP address, you can still get to it:
ssh username@rendezvousname.local
Replace username with the SSH user's name, and rendezvousname with the Rendezvous name of the machine. Sure is useful, especially if the hosts are on DHCP!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20041115123615413