Not Convinced
I'm just a little nervous about this, even on the PowerMac G5 performace page:
http://www.apple.com/powermac/performance/
Apple are clearly stating that the Pentium is rubbish compared to the G5, SJ has publicly stated in the past that CISC has gone as far as it can... and now we are going to use them??
Unless Intel have some exponentially better CPU's in the pipeline* that will deliver a massive performace gain then I think all this move is is a marketing manoeuvre to finally kill off the "Megahertz Myth" - a pretty poor reason, I can't see what major performance benefit we are going to get from Intel. This news comes just as IBM/Sony/Toshiba announce the Cell processor, a radical change in processor thinking, providing truly massive processing power.
* ie: not on the current roadmap
And now Apple publicly dumping IBM this way, the likelihood of Cell being used is Macs has all but evaporated. The other issue is that now we are at the mercy of Intel's processor decisions. I don't know what influence MS have over the development of Intel CPUs but I doubt that any dramatic innovation will occur at Intel that will cause a conflict with the operation of MS legacy OSs/installed user base, so you end up with old technology hanging around, try to please everyone, you end up pleasing no-one and Apples needs will not be heard.
My only hope is that this whole Universal Binary/OS-X CPU agnostic strategy is Apples' killer punch. Thinking of Steve's "...Apple likes having options" comment, should Intel produce under-performing CPUs and the Cell starts to take off, Apple could then transition to Cell, or at least offer another line of Macs while still allowing developers to easily maintain backward compatibility - or by using a hardware version of Quicktransit for Cell. You never know we could end up in a situation where we have Macs running a "Who-Give-A-Damm" processor, be it PPC/Intel/Cell/???
So I'm still a little sceptical and not really sure if this is a good or bad thing, Steve left some Grand Canyon style chasms in his presentation so we will just have to wait and see. If Apple can dump IBM that quick (referring to the G5 line), Intel could face the same.