Toggle Copy/Move Drag Action. Not exactly a "Vista only" trick, as it works on previous versions too. How many times have you dragged a file or a folder to a location in a different volume and realising just before releasing the mouse button that what you really wanted was move rather than copy? Well, all you have to do at this stage is press and hold the shift key before releasing the mouse button and voilà… no more repeating the whole action. I know it's a huge drag...