Quickly shift the brightness of a color (Illustrator CS/CS2/CS3/CS4)

Here's a trick for Adobe Illustrator that allows you to make your current color to just a little bit lighter or darker. In the Color panel, press and hold [shift] as you drag one of the sliders. When you do, all the sliders move at the same time, allowing you to fine-tune the brightness of the color. Don't like your new color? Simply undo your change by selecting Edit | Undo Color or pressing [command]Z ([Ctrl]Z in Windows).