Actually, even a lowly iBook from 2003 does have limited multitouch capability (using a third-party driver): the two-finger scroll as well as two-finger tap for secondary button press. And let me tell you, it was a revelation when I first tried it, after using regular touchpads and trackpoints on PC laptops for so long.

It's still the only multitouch gesture I regularly use on my latest version MacBook Pro, even though it supports pinch, rotate, three- and four-finger swipe gestures as well.

That said, I personally don't cosider multitouch a necessary feature on a mobile device. 770, N800 and N810 all have pretty mediocre resistive touchscreens. I would prefer a high-resolution, accurate, sensitive resistive touchscreen over capacitive touchscreen any day.