"About Plugin Manager 1.7.3
This update improves reliability for Apple's professional applications and is recommended for all users of Final Cut Studio, Final Cut Express, Aperture, Logic Studio and related SDKs.
Requirements: OS X 10.4.9 or later"

Thanks to Matt for the heads-up.
(FYI - the Other news/Software updates listing updated again also including Firefox 2.0.0.13 update to address several security issues.)

• Implemented rsync 3.0.0 to provide even greater fidelity when backing up using the "Copy selected items" backup method
• Improved the wording of options in the interface to make it more clear what CCC is doing
• Implemented "bootability" checks -- CCC now reports whether the backup volume will be bootable based upon the options you have chosen
• CCC now offers a dialog box to opt out of a backup task that is scheduled to occur when the target volume is reattached
• Resolved an issue in which an existing disk image selected as the target would not get mounted during a "Copy everything" backup
• When creating a new sparse image during a "Copy everything" backup, the capacity of the disk image is now the same as the capacity of the source volume rather then just enough space to accommodate the files that will be copied
• Resolved issues with installing the Authentication Credentials installer package from multiple source machines on a single target machine
• Adjusted permissions of the archival folders so that admin users can modify their contents
• Adjusted permissions of target disk image so that admin users can mount it read-write
• Resolved an issue in which scheduled tasks would not run upon reboot (Leopard only)
• Resolved an issue in which a backup using the "Copy everything from source to target" method would fail soon after erasing the target volume
• CCC no longer allows the scheduling of tasks that erase the target volume
• Fixed a regression in which the "invisible" flag is not preserved when performing a backup with the "Copy everything" method (Leopard only)
• CCC no longer errantly warns the user that specifying "/" as the path on a remote source volume will overwrite the boot volume
• Resolved an issue in which specifying a path with a space in it would cause CCC to back up to the wrong location on a remote Macintosh, potentially resulting in data loss

I've used CCC since it was first released, although some readers prefer SuperDuper (shareware).

• FireFox 2.0.0.13 (fixes several security issues)
• Crossover Games 7.0.0 (run some Windows games on your Intel-CPU Mac.)
• Microsoft Is Also Interested In Making Applications For Apple's iPhone (Wash. Post)
• DoubleCommand 1.6.6b3 (Remap your keyboard keys)
• NeoOffice 2.2.3 Patch 1
• World of Warcraft 2.4 patch notes
• Apple Is A Bad Windows Citizen (informationweek)
• Adobe Photoshop Elements 6.0
• BlackBox-Keyboards 1.1
• StuntMANIA!pro 2.6 (game)
• SimplyDisk 1.0 (Create fully customized disk images)
• Rudix 2008 (Unix ports and packages for OS X)
• VideoSpec 0.6.1 (AppleScript studio app to display info on video files)
• Intel Rolls Out Low-Voltage Quad-Core Xeons (5400 series - used in 2008 Mac Pros)
• PS3 version 2.20 firmware goes live, adds Blu-ray 2.0 (gamepro)
• PS3 firmware update to allow 'portable copy' of Blu-ray to PSP? (afterdawn)
• Blu-Ray Copy Protection Breached (informationweek)