Instantly Summon Accessibility Options from Anywhere in OS X Mountain Lion
OS X Mountain Lion makes it easier and faster than ever to access and tweak Accessibility Options from anywhere on the Mac. Just hit Command+Option+F5 and a preference window will instantly appear that allows you to adjust commonly used Accessibility features.
The settings list includes enabling zoom from keyboard or scrolling, enabling and disabling VoiceOver, toggles for sticky keys, slow keys, and mouse keys, contrast adjustments, and the ability to toggle screen inversion on and off. You can also launch the main Accessibility Options preference panel from the window, and clicking either Done or outside of the window makes it go away.
If you don’t have it enabled, the zoom features are very useful and allow you to hold down the control key combined with a two-fingered swipe gesture to zoom in and out of areas on the screen.