Apple has released a new version, 10.6.6, of its OS X operating System for Mac computers. This update fixes one security vulnerability, as well as other bug fixes and miscellaneous improvements. The update also includes the Mac App Store, a Web site that distributes Mac applications. More details on what’s in the update are available here, and you can download the update from the Support Downloads page.
Because of its security content, I recommend that you install this update as soon as you conveniently can.