Firefox 3.5.8 -- Despite the fact that Firefox 3.6 is available, those who haven't yet upgraded should pay attention to the just-released Firefox 3.5.8, which addresses a handful of critical security vulnerabilities, all of which could lead to memory corruption and the running of arbitrary code. These issues include several JavaScript-related crashing bugs, a vulnerability that existed in the way Firefox's Web Workers handled various data types when processing posted messages, and a problem with how the HTML parser freed used memory. Detailed information regarding the update's security content is available on Mozilla's Web site. (Free, 19 MB)

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TweetDeck 0.33.2 -- The 0.33.2 release of Iain Dodsworth's Adobe AIR-based Twitter client, TweetDeck, comes on the heels of a more substantial update. Changes first introduced in version 0.33 include an increased API call limit, a new Column Navigator, and support for media previews within TweetDeck of content from YouTube, Posterous, Flickr, Mobypicture and Twitgoo. The update also enables you to make changes to your search columns (rather than having to delete and recreate them), adds a new Help section that improves support and troubleshooting features, and addresses a long list of minor issues. Versions 0.33.1 and 0.33.2 each fix a few small bugs. (Free, 2 MB)

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VMware Fusion 3.0.2 -- VMware has released a small, but important, maintenance update to the company's virtualization software for the Mac, VMware Fusion. Version 3.0.2 corrects a compatibility issue that prevented VMware Fusion from running on servers running Mac OS X 10.6 Server. ($79.99 new, free update from 3.0, 407 MB)

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iStumbler 99 -- iStumbler is an easy way to scan for information about the Wi-Fi environment around you, as well as see available Bluetooth devices, and which Bonjour services are available on the local network. The latest version, release 99, works only with Mac OS X 10.6.2 or later, adds support for the 5 GHz band used by 802.11a and 802.11n, and takes advantage of the coordinate-based location feature in Snow Leopard to allow GPS-like tracking as the application scans. (Free, donation requested, 1.1 MB)

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