Sunday, June 29, 2003 Tutorial: SSH-Agent has a tutorial explaining how to use ssh-agent.

For those that don't know what it is, ssh-agent (and ssh-add) allows you to authenticate (type in your password) once and, for the rest of the local session, automatically authenticate to remote sessions (you don't have to type in anymore usernames/passwords).

For any systems administrator, this is a godsend (sp?). You can even run scripts remotely or pipe output invisibly with this technique.