In a lot of ways, overclocking really hasn't changed all that much (at least the basic principles anyway): changing either the bus speed or the multiplier value to run higher than the design spec. Obviously modern processors are entirely different beasts, but I don't think we'll ever get back to the "good old days" of being able to adjust the multiplier or FSB value on pretty much any motherboard/CPU combo. These days more and more components are being subsumed into the CPU, they're more like SoCs than traditional processors. While that means smaller systems overall it also means that you have far less control over your hardware. I'm making myself nostalgic now. My favourite board/CPU combo from "the old days" was an Abit VP6 running two P3-800MHz chips at somewhere around 1GHz each; I had FOP-38 heatsinks with Delta "screamer" fans and when they ran at full tilt the noise was horrendous.