I never really understood overclocking. Usually CPU speed is not your bottleneck unless you are playing games or cracking codes. Adding RAM is usually the best way to speed up a windoze machine, simply because the software is so bloated.
Easier than that is to go in and stop all those unnecessary processes that get added on, whether you want them or not. I usually try to keep the active processes down to one page.
It seems hard to do because things like Quick Time always seem to want to stay resident if you ever start them and come back when you boot. I go through the registry fairly regularly and delete almost everything in the "run" entries.
