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Does anyone actually use that trackball for anything other than text selection, though?

I find it to be very helpful for scrolling when reading web pages in landscape mode.

I use it to tell when I have text messages - it flashes green.

It's useful in many games.

You can use it as a physical camera buuton.

Cool! Thx.

Edit: It also freezes the focus when kept pressed down, nice!

I have a whole new respect for the ball now! One of my major complaints with the N1 was the awkwardness of taking photos with the screen facing away from me (e.g. self portrait). This tip pretty much addresses that.