I have a big place in my heart for the PPC 970's architecture, but I have to admit Intel's current Core offerings plus their upcoming roadmap are pretty good. What's in the new Macs is far better than what was available when Apple announced the switch. Back then I was thinking "P4 in an iMac? No way!"
Until I see first hand what it can do, I better bite my tongue. Currently I have a dual G4 1ghz machine running Gentoo Linux and Mac On Linux which runs 10.3.7 in a window. There's no emulation of OS X so its very fast. Then if I'm suckered enough, I can start VirtualPC 6 with XP all without taxing the system that much. If these new Intel's can match that, I might consider a Mac Mini.
AMD64 X2 trumps Intel...