Click-and-a-half
Mac OS X folders are spring-loaded: If you drag an icon onto one and don't let go of the mouse button, the window springs open around it so that you can continue your drag. But they still don't pop open automatically, as in Mac OS 9, when you hover over them after a "click-and-a-half"—when you double-click, then do another half-click, so that the mouse button stays down. (Sound complicated? Maybe that's why Apple killed it.)
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