Moore’s law says that the number of transistors we can cram onto a microchip will double every 18 months. This has been extrapolated to computing power, processor speed and various other things. I’d noticed a while ago that it certainly didn’t hold for computing power any more. 6 yrs ago, the top of the range clock speed for laptops was 600 MHz. It’s now about 2.2 MHz. According to Moore’s law extrapolated to clock speed, it should be 8.8MHz. I suppose maybe he never meant it to be extrapolated to clock speed but I did a bit of reading around and it seems it is no longer valid for transistor density either.
http://www.techworld.com/opsys/news/index.cfm?NewsID=3477
http://www.firstmonday.org/issues/issue7_11/tuomi/