Read Apple's Pro Mouse Specs (in pdf). It explains the neato technical features of the mouse. I like the final sentence-- "And yes, this mouse glows in the dark." It looks like the buttons on the side are for long drags-- if you have to pull the mouse across more space than your mouse pad provides. (Since it's optical, the mouse would register movement if you had to lift it to reposition.) So you hold the buttons on the side, and the mouse freezes. When you reposition the mouse, you let go of the buttons and continue dragging. Very nice. The buttons also look like good thumbrests.
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Read Apple's Pro Mouse Specs (in pdf). It explains the neato technical features of the mouse. I like the final sentence-- "And yes, this mouse glows in the dark." It looks like the buttons on the side are for long drags-- if you have to pull the mouse across more space than your mouse pad provides. (Since it's optical, the mouse would register movement if you had to lift it to reposition.) So you hold the buttons on the side, and the mouse freezes. When you reposition the mouse, you let go of the buttons and continue dragging. Very nice. The buttons also look like good thumbrests.