I am still running Slackware 11 on an old box. Used to run it as a server, now its mostly turned off, I have it in a big giant old chassis, with a bunch of hard drives (replaced it with cheap low power NAS box), I intend to install the mobo/PS back in a smaller chassis and just use for running dedicated game server for some older games I play online with friends and ventrillo.
It was originally a celeron 1.8ghz with 128mb of ram. Its probably almost as old as you are Spooky (not meant as an insult, since I can not insult a slackware user, its against the EULA!)