I have always liked gesture technologies. Apple has implemented some of them on the iPhone and MacBook (scrolling up and down, moving between images and web pages, etc), but they can go much farther.

It would be very useful on handheld devices, especially those without a keyboard. For example, using an iPhone that has more gesture technology, I could program a finger swipe to go back to the previous page while browsing the web, use a keyboard macro, open a program from inside another program, etc.

Handheld devices, while great to use, have significant drawbacks, simply because not everything can be fit on them. Using gestures would eliminate some of these limitations by expanding the capabilities of the device. As long as it's implemented correctly, obviously.

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