Apple's new range of iPads has taken most of the headlines after yesterday's launch event. But arguably they weren't the biggest surprise, or the best news, of the day.
In a shock announcement Apple also said that Mac OS X 10.9 'Mavericks' - the new update to its venerable operating system for laptops and desktops - is now free.
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And that's not just free to users of the previous version. Every Mac computer released since the 2009 Mac Mini will be eligible for the upgrade, via the Mac OS X App Store.
But why should you upgrade? What's different and what are the key new features?
Here's a great summary to let you know what's new in Mavericks.