Mac OS X 10.5.6 update Resolves Graphical Bugs

Apple users can now download the Mac OS X 10.5.6 update which not only fixes general operating system bugs but also includes fixes for possible graphics distortion issues with certain ATI graphics cards and improves printing for Adobe CS3 application suite and USB-based Brother and Canon printers.

Graphics

    * Includes general improvements to gaming performance.

    * Includes graphics improvements for iChat, Cover Flow, Aperture, and iTunes.

    * Includes fixes for possible graphics distortion issues with certain ATI graphics cards.

For more information head over here.