Apple has posted a number of maintenance updates over the last couple of weeks, providing few details about some of them (as we've come to expect, unfortunately). The updates are available via Software Update or as stand-alone downloads.
 (a 2.3 MB download) fixes an issue with DDP (Disc Description Protocol) and CMF (Cutting Master Format) files on Intel-based Macs.  (a 14.5 MB download) simply "addresses compatibility on specific hardware." And  (a 25 MB download) addresses bugs and adds support for the , which began shipping last week.
For photographers, Apple released Digital Camera RAW Support Update, which improves compatibility with the Canon Digital Rebel XTi/400D/Kiss X Digital, the Nikon D80, and Pentax *ist DS cameras. It also addresses issues with handling large Canon RAW files, addresses DNG compatibility on Intel-based Macs, and fixes a problem with exporting from Aperture. The update is available for (a 1.4 MB download) or in  (a 2.4 MB download). (I suspect that Apple means "Intel-only" on the latter, since universal implies that it would work on PowerPC or Intel-based Macs; however, the universal version would not install on my PowerPC-based machines.)
A more significant update is (a 125 MB download), which tackles more than . Examples include improved keyword support, Loupe behavior, and preview responsiveness, among other changes.
Apple also released a free, a fully functional version that works for 30 days. The 132 MB download does not include the sample images and tutorials found in the retail version.
Finally, although it's not a software update, Apple began offering an 8 GB version of its (PRODUCT RED) iPod nano (see "," 16-Oct-06). The bright red music player sells for the same price as the black 8 GB iPod nano, $250, but Apple contributes $10 of each sale to the  to help fight AIDS in Africa.