Major upgrade to the PDF editing software improves performance, adds redaction, enhances image editing, converts Web sites to PDF, and improves form capabilities. ($59.95/$99.95 new, $25 upgrade, free update for purchases after 14 February 2010, 42.8/43.1 MB)

Resolves security holes and fixes form submission. (Free, 37.56 MB for Snow Leopard, 46.71 MB for Leopard, 29.46 MB for Tiger)

Fixes minor MobileMe-related issues. ($79 as part of iLife, free update, 177.14 MB)

Adds Google Storage support, a slew of S3-specific features, and oodles of bug fixes. (Free, 19.2 MB)

Adds support for AAC and AAC+ streams, and corrects various bugs. ($32 new, free update, 11.2 MB)

Corrects minor bugs and updates internal audio components. ($32 new, free update, 6.9 MB)

Reduces CPU utilization during playback and corrects a slew of small bugs. ($32 new, free update, 3.7 MB)

Improves synchronization speed, print layouts, and more. ($49.95 new, free update, 8.3 MB)

Fixes a bug with too many redirects on a given page, and adds automatic updating and error reporting. ($24.95 new, free update, 1.7 MB)

Updated with bug fixes, Facebook and SmugMug publishing support, and 120 new lens profiles. ($299 new, free update, 79.6 MB)

Improves filtering accuracy, fixes bugs with Apple Mail integration, and introduces support for MailForge and Microsoft Outlook 2011. ($30 new, free update, 7.1 MB)

Updates workflows from the HTML 5 Pack. ($399 new, free update, 14.1 MB)

Addresses a rare freezing issue affecting some mid-2010 MacBook Pros. (free, 2.16 MB)

Upgrades to the latest version of the Gecko rendering engine and fixes several bugs. (Free, 15.8 MB)

Patches a host of security vulnerabilities in Mac OS X, including fixes to prevent maliciously crafted files from allowing arbitrary code execution. (Free, various sizes)