Apple's newest desktop/laptop operating system, Mac OS X 10.8 (otherwise known as Mountain Lion) was released this morning. You can only get it via download in the Mac App Store, for an impulse-worthy $20. We're still playing with ours; it's a minor update, especially compared to the complete overhaul that is the next version of Windows, though there are some new features here we're excited about, like AirPlay mirroring, a great new version of Safari, and a notifications bar. If you've got, like, a full day, check out Ars Technica's review - it's a 26,000-word, 24-page behemoth of a piece that covers all the ins, outs, and other prepositions related to the new update.