Securing OS X 10.5 sshd
Editing /etc/services and /etc/sshd_config helps to keep the script babies away.
There are a number of excellent how-to's addressing this such as
http://www.macgeekery.com/tips/security/basic_mac_os_x_security
One important point:
if the host is behind a wireless router, be sure to open the new port on the router as well, or you will cut yourself off!
