There seems to be one key thing to the move by apple to intel processors. One that most people seem to not have considered. The Cell processor for the console wars. Worldwide the ps2 sold 222 million units in fiscal year 2004.
Now considering each new ps3 will have a cell processor that only ibm can make, and there will be a huge huge demand for the PS3. Initial roll out which no doubt has already started, and given that you’ll probably have ~2% of chips that fail quality checks. Multiple millions of those processors need to be produced. Using no doublt multiple manufacturing floors. So some of the powerpc production facilities are being converted to cell. In the end this leaves less chips to be produced for apple.
Causing a neccesary debate about the viability of staying with the powerpc chip and possible shortages of processors for machines, and thus losing customers, or finding a alternative that can keep up with demand. In the end it would appear that apple has chosen to go with a supplier able to keep up with the demand for apple hardware. One would also assume that there is some kind of added discount to the production cost as well for the apple intel machines over apple powerpc machines. Adding a bit to the bottom line.