MacDevCenter has some good tips on Panther Unix connectivity, including coverage of the handy Connect to Server capability built into the Panther Terminal. Protocols such as ssh, scp, and sftp are discussed, albeit with no mention of the excellent freeware tool Fugu.
On a related note, while the article discusses using the PuTTY tool to ssh into a Mac from Windows, you can also securely log into your computer from some Symbian-based mobile phones. For those times when you have your mobile phone handy but not a notebook, PuTTY for Symbian OS puts you in complete control of your server from any place with cell phone reception. For those who are responsible for service uptime, the ability to perform server reboots and other critical maintenance tasks while away from the office could be a lifesaver.