Thursday Apple released Mac OS X 10.5.7. And, yes, I know, I’m a bit behind in my blogging! According to Apple, it "includes general operating system fixes that enhance the stability, compatibility and security of your Mac." Scroll about half-way down the page and you get more detail.
From the security perspective, there are fixes for Safari 3.2.3 and the Safari 4 beta, as well OS 10.5. Apple added RAW support for a number of new cameras. In addition, there are fixes for iCal, Mail, Parental Controls, and Printing, and some other things that fall into the "general" category.