This update will is important because it make easy to run Final Cut X, Compressor, and Motion software suites that Apple released.
Apple is soon releasing Mac OS X Lion so this update will be around the corner soon, Don’t forget to make your backup before updating.
Apple is releasing update but 10.6.7 users are not complaining any issue on the current software version.
You will find this update via Software Updater or you can download standalone installer from HERE,
P.S. You need to be running Mac OS X 10.6.7 if you are updating via standalone updater.