This clip is just too awesome.
I hate having to move from the keyboard to the mouse and back again, usually when dealing with programs with poor UI and no keyboard shortcuts. Although the mouse is more intuitive than the keyboard for most people and allows us to not have to remember all of those hotkeys.
With systems like this, you can easily have mouse-like functionality without the mouse, and hardly have to move your hands away from the keyboard at all. Very Minority Report.
Check out the full video on the ScobleShow.