OS X: the Secret iPod OS?
It is actually possible that iPods have used a subset of Mac OS X code for some time already, in secret. Apple has never made any comment on what operating system existing iPods run, ever since the company moved from Pixo, the operating system that ran the very first iPods.
A brilliant series of very thoughtful articles about virtually every aspect of the iPhone, that begins with Macworld: Scorecard and Secrets of the iPhone.
The quote above is from Apple’s OS X: How Does it Fit on the iPhone?.
Go read. Blow your mind.