Software is way-far-behind the curve in terms of real advancement... I'm just saying that the typical user will not see the difference in a 1GHz vs a 2GHz for 90% of all their applications on current hardware. It wasn't always the case. I'm guessing that lack of memory is the major problem with older PCs with newer operating systems. This little Dell laptop with ~400 MHz Celeron and 256M memory runs great for posting on this board... Its perceptably much faster than it was when I had win ME on it a couple years ago...
I think you will find that Intel has reached a plateau at its current yields on P4.... This is a good thing. Maybe software development will catch up to the current hardware and deliver rock-solid, high-performance apps, optimized for the hardware its on.
Internet 2 is designed to improve routing in a high-speed network infrastructure... It does nothing for joe six-pack with his 56k modem.
Finally: Physics has a speed limit, too...