Same, my PC is about 2 years old ran Doom 3 kick butt, and can handle anything that is forthcoming too, like Oblivion. I have no plans on upgrading in the near future (at least a year). My other PC is 5 years old and runs win98 so I can still play my Command & Conquer series games. But that machine will handle any of the ie games or any game released since 2000 up to about a year ago fine. And as we know many of us still play those types of games like Wizardry 8 or PS:T still (except Volourn), and the machine is great for those types of games. A 5-year-old machine handles about half the games I play.
IIRC I think I have had three PC systems since 1996 and I have yet to find a game that played poorly on any of those machines during that time. From my experience, everyone is different though; I would say the upgrade of a PC is about equal to the release of new console, at least for me. And I can do all my programming on the PC, email, message forums, news, television, DVD movies, scanning, graphics work, printing, etc