Apple Inc. this week began testing Mac OS X 10.5.3 Update, a third maintenance and security update to its relatively new Leopard operating system that already bundles over 75 bug fixes and code corrections.

The Mac maker on Thursday informed its vast developer community of the availability of Mac OS X 10.5.3 Build 9D10, a pre-release copy of the software update featuring a core focus list spanning some two dozen core components.

Among those components in need of evaluation, people familiar with the matter tell AppleInsider, are AddressBook, AppleScript, Audio, Back To My Mac, Dashboard, the Dock, DVD Player, Finder, Graphics, iCal, Mail, Portable Home Directories, Printing, Rosetta, Spaces, Spotlight, Time Machine, and VoiceOver.

In a set of developer notes reported to have accommodated the update, Apple is also said to have listed 75 code corrections that have already been baked into the first external build, including two aimed at critical memory leaks within CoreAnimation and iCal.

Other fixes target Dashboard, iCal alarms and syncing, Installer App, Spotlight indexing, PDFs within the Preview App, Mail alarms, Spaces, Stacks and the Dock.

Mac OS X 10.5.3 is presumed for a release sometime in April or May.

more info. http://www.appleinsider.com/articles/08/03/28/apple_begins_widespread_testing_of_mac_os_x_10_5_3 _update.html

UPDATE:

Apple Seeds First Mac OS X 10.5.3 (9d10) Version-

Apple issued the first Mac OS X 10.5.3 seed (9d10) to developers yesterday. The latest update to Apple's Mac OS X Leopard addresses dozens of outstanding issues.

Fixes range from Dashboard, Parental Controls, iCal Synchronization, memory leaks and stability issues. All in all, 75 distinct bug fixes are listed in the accompanying seed notes.

A few known issues remain, and Apple typically seeds a number of developer builds for testing before releasing the final update to customers. While these point releases generally provide bug and stability fixes only, the 10.5.2 seed also addressed some user interface complaints. The current version of Mac OS X (10.5.2) was released in February 2008.

From Netkas forum

No support for Nvidia 9xxx.

Whew...I was going to purchase an NVIDIA 9800 GTX one of these days. Thanks for telling us in advance, lol. =)