Imagination is key
I believe that multi-touch is just the beginning of how we will interact with computers in the future. Voice control will also need to be integrated. Most operations like writing, note taking, commands like open file, searches, can all be implemented via voice. Touch then is used to interact with the material being displayed.
The combination of voice and multi-touch is where we are going, however multi-touch is a misnomer, as there would be little need to actually touch the screen. The computer via a camera or via the screen integrated sensors (Apple patent where camera sensors were part of the screen) can view and react to our gestures (minority report like).
I think we are at the edge of a big shift on how we interact with computers. Yes voice recognition and multi-touch have a ways to go, but we are already at the beginning of the yellow brick road.
It is now time to open our minds and recognize it. Forget keyboards and mice they hold you back and keep from from the vision.
Both companies M$ and Apple should be commended for recognizing the need and for the research they are doing in user interaction with out the need to actually touch the computer.
Use your imagination, it is coming.
Forget the 12 hours at the keyboard, remove from your mind the tired limbs from holding your arms at odd angles. All that is holding you back, you are thinking of the mechanics and implementation. Those are issues to be solved by Apple and M$. Your job is to ignore all of that and instead dream how to write the applications that can be controlled via speech and gestures. Leave the mechanics to Apple and M$. Computers are very powerful and will be even more powerful in the future. 12 cores, 64 cores, 1024 cores will be possible. Your tone and voice will be recognized with 99.99997% accuracy and the computer will correct it at the end of the sentence when it can then see if the word it selected fit within the sentence or not.