Parrish S. Knight is a systems administrator for an IT consulting firm in the greater DC area. His interests include politics, film, fantasy, and science fiction. In addition to getting the word out about Mac OS X's mouse problems, his causes include activism in autistic advocacy and civil liberties.
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-]).