PC Weasel 2000, a video card
that provides a serial console interface to an x86 computer.
(The CS7500 is a good switch for sharing a phone line with a phone,
fax, modem, and answering machine.)
This is a very useful tool which allows you to run multiple concurrent
ssh/telnet sessions. You get one window per session, plus a master
window. Text typed into a session window goes only to that session.
Text typed into the master window will go to all sessions. This tool
feels very much like Sun's cconsole, but is more capable. (The author
had apparently never heard of cconsole when he wrote it, which just
shows that the tool addresses a common need.)