A good user interface should be easy to use. For one thing, it should be intuitive.

 

Anybody know what these buttons do?

Go get the ball, Fido!

What's the difference between these five commands?

What happens when you drag the disk into the trash can? Is that what you expect to happen? After all, what does the trashcan do?

Busy, busy, busy.

In case your head gets stuck on your right shoulder...

Again, too busy. Do we really need that M logo on every tab?

I'm number zero! Woo-Hoo!