[lotso]

I wouldn't say adding pen input would make the iPad a multitasking device.

[coldtea]

He doesn't mean it in the CS "multitasking" sense.

He means it would try to be two things at the same time (a painting surface and a regular tablet), a "jack of all trades, master of none" thing.

[theguycalledtom]

The iPad has already mastered touch tableting. Adding a digitiser does not change that.