how to benefit from touch-screen

"Remember that it took 30 years between when the mouse was invented by Engelbart and English in 1965 to when it became ubiquitous, on the release of Windows 95.  So, by that measure, multi-touch technologies have 5 years to go before they fall behind."

According to Bill Buxton's theory, multi-touch technology still have 5 years to go. What can we benefit from multi-touch screen? I personally found type on an iphone is actually pretty painful. From a typing perspective, I would rather go for a key board. I believe the advantage for a touch device like iphone or ipad is the continuous touch action and degrees of freedom. Which makes me think what is a petter game or app for a touch device like that. For me, it will be use less and less buttons, require less typing action,and use more and more slider or tracking function.

http://www.billbuxton.com/multitouchOverview.html