MacRumors.com

Apple issued a new seed of Mac OS X 10.5.3 (build 9D27) to ADC developers tonight, detailing a number of new bug fixes and listing no known issues. The newest version of Mac OS X provides a number of bug fixes and stability improvements over the current public version (10.5.2) but remains in limited testing amongst developers as Apple finalizes its code base. Apple first started testing Mac OS X 10.5.3 on March 28th.

Apple appears to have begun seeding these test versions more frequently than in the past. Historically, Apple has waited until development was wrapping up before accelerating their seeds.

Regardless, we've heard anecdotal reports that even the latest version has stability issues which means Apple still has some work to do. Once released, the 10.5.3 update will be available for free through Mac OS X 10.5's Software Update.