Why assume the A4 is a dual-core PowerPC when it's built for an OS that restricts the use of multitasking?
Because Occam's razor tells us that this surely must be the case. Of course you put a dual-core processor to churn binary translation into your mobile device!
Sony loses money on every PS3
Are you sure about that? The component costs have come down by a lot since launch (esp. the Blu-ray laser, but also the Cell CPU) and I'd not be surprised at all if they turn a profit nowadays, especially with the Slim. But the big money is certainly in collecting license fees.
New York... when civilization falls apart, remember, we were way ahead of you. - David Letterman