Comment I've got one of the oldest primary computers here (Score 1) 543
A few months ago, my Thinkpad R61's GPU died at about 2.5 years. Being of the cheap and miserly sort, I opted not to spend the money to have this fixed or replaced, and rather set it up as a server. I dusted off my old Thinkpad R31, now 7 years old, installed Debian, worked out a few quirks, and started using it as my primary computer--that is, the computer that I use to write papers, check email, browse Slashdot, program, etc. It works reasonably well. All the games I play are even older than the computer (Civilization III, Close Combat, Combat Mission, Nethack, ADOM), and Debian, even with Gnome, is reasonably lightweight. All that old software is still around. You don't need the latest bloatware, for the most part. Mathematica and Matlab, I run via SSH. Flash video is about the only thing that really gives me trouble--it stutters badly. The battery is dead, but the same could be said for the R61.
Replacement parts are promising to be a pain. I considered upgrading the RAM to something more reasonable, but balked at the $70/512MiB price of the obsolete SDRAM sticks it needs.