imho, AMD was leaveraging their performance advantage against intel's clock speed naming system... check the benchmarks, they perform about the same based on the current naming protocols... I think it was just wonderful marketing by AMD and a slow uptake by Intel that their system was being used to AMD's advantage.
at the end of the day though, I'm inclined to agree with Thump553... the latest generation hardware is miles in front of what all but the most power hungry user needs. I still use an athlon 1.4 gHz with 512 mb ram for photo and video editing and it does the job admirably for my (admittedly only amateur) requirements.
I must admit I'm feeling the need for an upgrade soon though! atm it is so cheap for a quality motherboard with plenty of ram and a nice new p4
