Adobe has released Photoshop CS6 13.0.1 with fixes for two critical security vulnerabilities that could lead to malicious code execution. According to a Secunia advisory, this buffer overflow vulnerability occurred during a boundary error when processing a PNG image. In addition to the security patch, the new release aims for better stability with fixes for 31 specific crashing issues, and it provides a variety of fixes for 3D features and the Drawing and Graphics tools. ($699 new, $199 upgrade, free update, 7.9 MB via direct download, release notes)
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-]).