The decision to abandon the PowerPC architecture as the heart of Mac hardware does not sit well with many Apple users, even if Jobs delivered a somewhat convincing performance to justify the switch. According to Jobs, Apple intends to get the "best" computers to their customers and IBM apparently was not able to offer the right mix out of speed and power consumption in its processor roadmap. While it has not been specified by Apple, which Intel chips will be used for the new "Mactels", sources told Tom's Hardware Guide that it is most likely that the company will jump on the next generation Pentium M processor - the Yonah chip.
http://www.tomshardware.com/hardnews/20050615_161033.html
personally i believe this is a heruggeeee mistake for Apple as the PPC arch is fantastic and the rosetta layer (to run ppc mac progs on intel h/w) can not use altivec support <due to the lack of any such unit on any x86 hw
