I'm sticking with the past (XP) as long as possible.
Me too. Having started with the TRS80 model I, and having tried almost every OS since that time (including Commodore64), the thought of having to learn yet another operating system with no demonstrable advantages in my casual usage does not excite at all.
And having had to wrestle with Vista systems belonging to friends, and also at our local church on an ongoing basis, my resolve is strengthened every time I am forced to do so.