Apple has released an update to iTunes that addresses a few outstanding bugs in the program and adds support for Mountain Lion.
According to the update's Web page, the update improves performance and addresses problems involving syncing with a first-generation iPad that holds an iBooks textbook; photos syncing out of order; and unexpected deletions of apps and iTunes playlists.
In addition to these fixes, the update adds support for the iOS 6 beta that was released to developers today at WWDC 2012. The update is a 170MB download for OS X users, but is also available for Windows (both 32-bit and 64-bit) as a smaller 75MB download. These are available through Apple's Software Update services but can also be downloaded from the iTunes Web site.
As always, be sure to back up your system before applying this update.