CNet provides an interview with Michel Mayer, CEO of Freescale Semiconductor. Freescale is the Motorola spin-off which provides Apple with the PowerPC G4 processor used in the Mac Mini and current Mac Laptops. Apple has a contract with Freescale to fulfill G4 processor orders until as late as Dec 31, 2008 if required. (Apple is under no obligation to continue purchasing them through that time, however.)
The interview provides some confirmation of Apple's earlier consideration to move to Intel.
In my previous job, I ran IBM's semiconductor business. So I've seen both sides of the Apple story, because I sold the G5 to Steve (Jobs) the first time he wanted to move to Intel.
This information was previously revealed in an internal IBM newsletter about Apple's potential switch to Intel at that time. Instead, Apple went forward with the PowerPC 970 (G5).
Meanwhile, Mayer goes on to say that IBM's focus has shifted to consoles:
IBM decided not to take the G5 into the laptop and decided to really focus its chip business on the game consoles.