A few I can think of: - Open the Apple menu. Now hold Shift. More menu options! Now try holding Opt. Even more menu options! This works for several Apple applications. - Hold Opt when clicking on a menubar icon for extra information. For example, holding Opt and clicking the WiFi icon in the menubar brings up the signal strength, IP address and other useful information. Likewise for the rest of the icons. - In Spotli…
This also works with Exposé, it's particularly nice if you set up hot-corners in the system preferences to trigger exposé:
1. Start dragging something.
2. Flick to a corner to tile windows exposé style.
3. Drop the dragged object on the window of your choice.