I have a 3.4GHz Pentium 4 thats slow as hell for day-to-day tasks compared to my 800MHz G4 iMac (no joke), so obviously Mac OS X makes much better use of its processor. I think using Intel will be a step in the right direction for Apple. I just hope they don't put those ugly intel inside stickers on Macs
Also I think Apple have shocked the computing world so much to (for some part) have teamed up with someone who had been a strong supplier to 'their enemies'. Apple are getting lots of attention now. People are standing up saying what the? It's exactly what Apple wants, and what they need. This is a new era of Macs.