It’s not a small download, but all Apple says about the Lion Recovery Update is that it improves Lion Recovery and fixes a bug related to Find My Mac when using a firmware password. Hopefully you won’t have to rely on Lion Recovery, which enables you to perform some troubleshooting and to reinstall Lion by booting from a special hidden partition on your hard disk. Software Update is the easiest way to get and install this update. (Free, 431.91 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-]).
Lion Recovery Update
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Special thanks to Steven Hegarty, Eleanor Holt, Gregory Gaich, and
Michael Bach for their generous support!