Double tap is not multi-touch, you're only touching the screen at 1 place at any time. Multi-touch is pinch-and-zoom, which allows the screen to recognize multiple touches at the same time.Multi-touch, or pinch-and-zoom?
I can multi-touch (double tap) my screen and it zooms in or out, so as far as I know it's already supported.
Not so much, HP has multi-touch on some of their devices, and the Palm Pre has it.don't think so. I think Apple has a pretty tight hold on multitouch.