Apple has released Final Cut Pro X 10.0.9, a small update that fixes issues that could result in green artifacts when using Sony XAVC media. The release also addresses problems with failed exports that were related to interlaced media and retimed segments, and includes the usual unspecified stability improvements. ($299.99 new in the Mac App Store, free update, 1.64 GB)
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-]).