[spiralganglion]

Mac pro tip: Option-click everything. It's remarkable how many secrets are lurking behind near every UI element.

And once you've option-clicked, also option-shift-click, command-click, control-click, etc.

An easy favourite is the Wifi menu bar item. Option-click to see all sorts of useful info about your current connection, including IP address, MAC address, connection speed (Tx Rate), the amount of noise, etc. And when you've option-clicked the menu, hovering over network names shows you the key info about that network.

[M4v3R]

Yeah, pretty much every icon in the menu bar has an Option-click alternative. I very often Option-click the volume button, which lets you select input and output devices without opening the sound preferences pane.