>Imagine a typical scenario. You are walking down the street and suddenly need to navigate somewhere. How many minutes are you going to waste playing with that little nub and resizing things on the screen before finally pulling out your phone and just using that.

Reminds me of a joke I heard:

A local school board was trying to find ways to increase the efficiency of their schools. A local computer programmer had come to the board meeting with a proposal.

He suggested that each desk be equipped with a small button, that via wireless technology would light up a small panel on the teachers desk.

That way if a student wanted to ask a question, they could simply press the button which would light up say spot A17 on the panel. Then using a quick lookup sheet the teacher could then see that desk A17 is where John was sitting.

The teacher could then look up quickly and say, "John...you have a question?"