Apple has just issued the latest update for its Leopard operating system, Mac OS X 10.5.7, bringing with it a variety of bug fixes along with security updates and expanded hardware support. Although there's nothing groundbreaking in this release, with Snow Leopard already on the horizon, some of its highlights include improved video playback on newer Macs with Nvidia GPUs, additional RAW image support for a number of newer DSLRs, and better Finder search results for network volumes that don't support Spotlight searching.
The update also addresses problems related to logging into Gmail, printing to third-party printers, syncing notes in Mail, and various other small things. Mac OS X 10.5.7 is available via Software Update or as a standalone download, with sizes starting at 442 MB for people upgrading from Mac OS X 10.5.6, and going all the way up to 729 MB for a combo update compatible with any version of Mac OS X 10.5.
You can read more about the update and get a full list of changes here. It might be wise to wait for some feedback before taking the plunge, however, as several people have already reported troubles with the update.