I didn't believe it was possible when I first heard the rumors a few weeks ago, but Here it is: Apple will transition to x86, specifically Intel, in 2006. The whole line will go x86 in 2007. Microsoft is behind the switch, as is Adobe. Interestingly, the developer transition kit has an Intel compiler at its core. I wonder why not GCC.
The next question is how well it will be pulled off. In theory it could be seamless. It needs to be.