There was a really interesting panel at SXSW this year regarding the 'Future of Touch User Interface' by two guys from Microsoft ( http://schedule.sxsw.com/events/event_IAP5984 ). I think trying to create a mouse interface on a touch device is almost a regression, not a step forward. I'd much rather see improved touch w/ voice integration, better multitouch, etc.
As leader of RoamTouch and creator of its vision I can tell that we did not decide to simulate a mouse at all. We saw the picture of the future (five coming years) in 2006, the household and we are not improvising. Today PadKite is a mouse and playful kite, its also the hook for a new type of integration that aims to run on top of other applications and video, grow not only on the tablet and smart phone but also to grow to be remote controlled in a living room scenario (coming decade arena). PadKite is the proxy or bridge between today and the future.
In my opinion the future of computer is tactile. It is the most effective way to interact with a computer with the less energy consumption. The future is not in voice and body movement recognition technology. I do not imagine a working day (6-8 hs non stop) jumping or speaking, even moving arms to do 3D stuff. Its all about energy consumption and the most effective way to use our brains are with out hands, and millions of years have passed for that to be in such way.
PadKite and the GestureKit are an approach to start thinking about the big picture to come. It will be fun!.