Someone on The Inquirer has been clearing out his computer junk. I've go a fair bit myself. Under my desk are a couple of PCs, one an ancient AMD K6, the other a more useful Athlon 800 that I put together from spares. I also have a few boxes of assorted parts that I might find a use for. There's one box of stuff I definitely don't need, but can't bear to throw away. I have most of it listed on my Multiply site for people to browse. Some went to people via Freecycle. There just comes a point where nobody wants some of it because it's just not generally usable. Some will use an ancient PC as a firewall, but that's a power-hungry way to do it. I certainly couldn't justify leaving a PC on all the time. I rely on my router to protect me and that is only on when the PC is on.
I know others with even more antique kit. Maybe they hope it will become collectable. I did see that someone sold an old Apple II for over $1000 recently, but you have to have the really rare stuff with all the original manuals etc to get that sort of money.
So what's the oldest bit of computer kit you have? Mine is probably a Logitech digital camera that does around 100 kilopixels in shades of grey. I even have the box for that.