I have been meaning to mention this for awhile now… I have had a long standing grudge against Apple’s “Quartz Extreme” technology (which uses the 3D accelerator on the video card to aid in window drawing), mostly viewing it as a crutch for an otherwise ill performing UI. While this may still be true, Exposé finally justifies the Quartz Extreme technology. Finally there is something that OSX provides through Quartz Extreme that wouldn’t be possible (or at least extremely inefficient) otherwise.