Apple CEO Tim Cook announced that Mountain Lion would be released today and now the latest version of OS X is available for download. You can grab it from the Mac App Store.

Prepare to be patient, as the download and install process could take a while -- of course, you backed up first, and you're not upgrading a mission-critical machine right away, right? Once you get it up and running, let us know in the comments what think about the new features in OS X.

Our full review of Mountain Lion is published, and we'll have more coverage throughout the day. We'll talk about the new features in the operating system and there's a TUAW TV Live with Steve Sande this afternoon that'll focus on Apple's latest OS.