Apple has released OS X Mountain Lion 10.8.3 and the first security update of 2013. The update includes a number of good improvements including:
The ability to redeem iTunes gift cards in the Mac App Store using the built-in camera on a Mac
Boot Camp support for installing Windows 8 and Macs with a 3 TB hard drive
Various fixes for issues that cause a URL to quit apps unexpectedly, that might cause Logic Pro to become unresponsive and stuttering audio on 2011 iMacs.
The update also includes Safari 6.0.3.
The update is available via Software Update or through the Mac App Store. You can find the full support document on Apple's support site.