Computerworld:

To recap, here are the reasons, I believe that Apple will choose the ARM platform for their upcoming Netbook/Tablets.

  1. Apple has an internal PA Semi team working on future ARM chips for the iPhone/iPod Touch
  2. ARM chips cost an order of magnitude less (to license) than Intel equivalents
  3. ARM chips take up less space on a motherboard
  4. ARM chips use many times less power, enabling much longer battery life and much sleeker design.
  5. You won’t need to virtualize Windows on these types of devices.  Most other Apple applications can be easily ported between chips.
  6. Apple wants more control over the processors, which it can’t have with Intel.
  7. While a variant of the iPhone version of OS X is the most likely of candidates, Snow Leopard’s optimization release might also be for ARM as well.

I agree. Apple has used ARM in the past (the Newton) and presently inside the iPhone and iPod Touch. The mobile version of OS X  already runs on these (and quote well, frankly). If Apple makes a netbook/tablet based on the mobile OS X, then an ARM chipset will be the engine running it.