I'm a big fan of old hardware. My laptop is a 5 year old Panasonic CF-51 Toughbook. It looks like these also sold new for over $2000, but I got it for free. 1.7Ghz, just upgraded to 2GB of RAM, running Ubuntu 10.04 beautifully. I also just built a
MythTV box using an HP D530, which is probably about 6 years old. The oldest computer we have is an old PowerMac from 1996. It still runs, but theres not much it can do anymore so it never gets used.