The 10.5.7 Update is recommended for all users running Mac OS X Leopard and includes general operating system fixes that enhance the stability, compatibility and security of your Mac.
* Includes latest security fixes.
* Includes additional RAW image support for several third-party cameras.
* Improves performance of video playback and cursor movements for recent Macs with NVIDIA graphics.
* Resolves an issue with Dvorak keyboard layout in Mac OS X 10.5.6.
* Improves the reliability and accuracy of Unit Converter, Stocks, Weather and Movies Dashboard widgets.
* Addresses a situation that may cause issues when logging into Gmail.
* Improves reliability when syncing contacts with Yahoo!.
* Expansion Slot Utility for Mac Pro now reports the correct PCIe slot configuration.
* Improves network performance when connected to certain Ethernet switches that have Flow Control enabled.
* Improves stability for network home directories hosted by Mac OS X Server v10.4.
* Improves Finder search results for network volumes that may not support Spotlight searching, such as Mac OS X Server v10.4, Time Capsule, and third-party AFP servers.
* Includes several improvements to Directory Service and Client Management, which are described in the About Mac OS X Server 10.5.7 Update article.
* Improves overall reliability with CalDav.
* Improves reliability when automatically syncing with MobileMe.
* Addresses reliability and sync issues with Notes.
* Addresses an issue that may cause the BCC field to populate incorrectly when redirecting a message from the Sent mailbox.
Parental Controls Improvements:
* Improves consistency with Parental Controls and application restrictions.
* Addresses an issue in which time limits may not work properly with full-screen games and Fast User Switching.
* Resolves an issue that may cause certain third-party printers to print to the incorrect paper tray.
* Non-admin user accounts can now be allowed to add and remove printers by enabling Parental Controls and selecting "Can administer printers".
* Includes other printing reliability and stability improvements.
For detailed information on this update, please visit this website: http://support.apple.com/kb/HT3397.
For detailed information on security updates, please visit this website: http://support.apple.com/kb/HT1222.