Apple has released MacBook Air Flash Storage Firmware Update 1.0 for MacBook Air models released in the middle of 2012. The release addresses a rare problem that could cause a system to fail to recover from a crash. As always with firmware updates, we recommend relying on Software Update or the App Store app to ensure you get the firmware update for your specific model, and being careful not to interrupt the update process. Apple also notes that your MacBook Air will shut down after the update is complete, and that you should wait one whole minute before restarting it. (Free, 1.69 MB)
Go Back and Forth Fast in Preview
If you're reading a PDF in Apple's Preview software, and you follow a bookmark or an internal link to move around within the PDF, you can quickly return to where you were by pressing the keyboard shortcut Command-[ (that's Command-Left Bracket). Or, you can choose Go > Back.
The command works iteratively, so you can go back to just the previously viewed page or if you issue the command again, to the page before that, and so on. There's also an equivalent Go > Forward (Command-]).
MacBook Air Flash Storage Firmware Update 1.0
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As an aside, I tried to find the history of updates as I would have in the "old days" (e.g., Lion and earlier) when another tab in software update would reveal each one going back a long way, perhaps to the last (maybe only) "clean install."