You’ve got the whole world in your hands—or at least on your Mac—with Google Earth. Google has bumped the globetrotting software to version 6, which is now available for Intel-based Macs only. The new version adds access to a variety of views, including Street View, 3D trees, and historical imagery. Other additions include ground-level navigation, 3D measurements, and improvements to the Tour Recorder. Google Earth requires Mac OS X 10.5 Leopard or later. Note that Google Earth 6 turns out to be a beta, something that wasn't initially clear; it may be worth waiting for an official release to upgrade. (Free, 53.3 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-]).
Google Earth 6
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