I dont know. I got a core i7 950 @ 3ghz for my new workstation at home, and with a corsair bolt on water cooler I was able to easily get it to 4.2ghz stable. It runs cool and only uses a couple hundred watts. It crushes anything I throw at it, so why not overclock?
If you overclock because you enjoy tinkering with your hardware or if you actually need every little clock increase for whatever it is you're using your computer for, more power to you. But I think he has a point - overclocking is not as necessary anymore for "standard" users/gamers as it was a few years ago.
I, too, overclocked everything back in the days of the 486, Pentium, P2, P3 (plus the various AMD alternatives). But that was mostly because back then the clock increase actually made a huge difference when playing games, because most stuff was CPU limited. Overclocking my PII-400 to 450 actually meant I could choose more graphical details or maybe a higher resolution in the games without getting FPS which were too low to play.
But today, when I overclock my i7-2600K (which cost much much less than my PII-400 back then), I notice no difference at all in games or in any other application, even stuff which should be only about CPU speed (say, zipping a couple hundred megs of files). Yes, maybe I save a second or two when I zip files, but does that matter? Any CPU which you can buy right now (if you do not choose something extraordinarily slow like an Atom CPU etc.) is fast enough that it does not limit you in any meaningful way when you do normal stuff or even games on your computer. Gaming performance today is limited by the graphics card, not the CPU. So if you have a decent graphics card which allows you to play at the native resolution of your screen with full details, overclocking your CPU won't give you any noticeable benefit. And that's why I do not overclock anymore. I just don't notice any difference to the standard clock speed.
Like I said, if you overclock because it's fun for you or because you need to run extreme calculation tasks 24/7, go ahead. But for games or normal applications? Nah, not needed anymore.