Smile has updated both PDFpen and PDFpenPro to version 5.8.5 to add compatibility with OS X 10.8 Mountain Lion. Additionally, both releases fix an issue with scanning when running 10.7 Lion, as well as an issue where resampling at a lower resolution produced a larger saved file. Both updates are rounded out by other unnamed minor fixes and improvements. ($59.95/$99.95 new with a 20-percent discount for TidBITS members, free update, 40.7/41 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-]).