If you found Macworld Expo useful this year, or if you're regretting having missed it, you can register for a free pass for next year's show (January 25th through 29th, 2011). The offer is good until 8 March 2010.
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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-]).
Written by
Tonya Engst