CornerClick [via]: associate one or several actions to mouse clicks (with or without modifier keys) in each screen corner. Since Tiger, Apple developers have found out about Fitts’s Law, so clicking the upper left and right corners activates the Apple menu and Spotlight, respectively, but there’s still the lower corners — and I never click the Spotlight icon, always use the keyboard shortcut.

I know Exposé can already be activated by shoving the pointer in a screen corner (incidentally, I couldn’t make Exposé work with CornerClick — might be a Panther bug), but it’s different here: I loathe “hot corners”, that are triggered as soon as the mouse arrives in a corner; here you have to click in a corner, which can’t be accidental.

Seems like it could be very useful; I’ll see how to put it to good use when I get back to my iMac.