Seriously though, turn on tap-to-click. Never worry about physically clicking it again.
> What's fucking wrong with buttons?
A multi-touch surface such as the MagicMouse or Trackpad on a recent Apple laptop is so ridiculously more customisable than a mere one or two or even three physical buttons + regular trackpad.
Taps, with 1-4 fingers. Swipes in 4 directions with 1-4 fingers. Swipe from the sides. Pinch/Spread with 2 fingers. Pinch/Spread with thumb and several fingers. Rotate.
Seriously, this is just what's available out of the box with OS X, before you look at third-party software to track even more gestures on touch (trackpad/mouse) surfaces.
Edit: clarified that pre-force-touch trackpads are top-hinged.