Actually only on my second  desktop computer since then. Got it right after moving into this house and we moved here right around Thanksgiving 2006. Yes, my desktop is that old. Have upgraded some stuff on it though but it was very top of the line back then. It still handles everything I throw at it just fine. (well, most things except maybe video editing)
I do have a new Mac since this past Christmas. Still trying to figure it out but I'm getting used to it pretty good and liking it more everyday!

Oh, and I have gone thru a couple of laptops since then. They just don't seem to last very long.