Mac OS X 10.5.8 update is now available through Software Update. Among the listed improvements are a resolution for compatibility issues when joining AirPort networks, disappearing monitor resolutions in System Preferences, Bluetooth reliability and the ubiquitous operating system fixes that enhance your systems stability, compatibility and security. And really, who doesn’t want that?
The update will also upgrade Safari to version 4.0.2. There are a number of other reliability and compatibility tweaks listed here. Security features are available here. The combo update is also available here. Enjoy.