Apple has released the recommended updated Mac OS X 10.5.5 for all users of Mac OS X 10.5x Leopard which includes over 100 bug fixes and more than two dozen security enhancements. Yikes. The staff at AppleInsider writes, “As of press time, the 321MB update was only available via the Software Update mechanism located under the Apple menu of your Mac.”

General stability improvements and over two dozen security enhancements are included in the update. It also addresses issues with Disk Utility, iCal, MobileMe, Mail, Address Book and Time Machine. Here is the detailed list of the fixes included:
General
• Includes recent Apple security updates.
• Addresses stability issues with video playback, processor core idling, and remote disc sharing for MacBook Air.
• Addresses an issue in which some Macs could unexpectedly power on at the same time each day.
• Resolves a stability issue in TextEdit that could be found when accessing the color palette.
• Improves Spotlight indexing performance.
• Fixes an issue in which contacts might not sync properly with PalmOS-based devices.
• Improves iPhone sync reliability with iCal and Address Book.
• Includes improvements to Active Directory (see this article for more information).
• Improves Speech Dictionary.
• Fixes Kerberos authentication issues for Mac OS X 10.5 clients that connect to certain Samba servers, such as Mac OS X Server version 10.4.
• Includes extensive graphics enhancements. Address Book
• Addresses stability issues that may occur when creating a Smart Group.
• Resolves a printing issue with address cards containing information that spans more than one page. Disk Utility and Directory Utility
• Improves reliability when rebuilding a software mirror RAID volume in Disk Utility.
• Improves reliability of server status displayed in Directory Utility.

Read more here: Mac OS X 10.5.5 Update Released

(Via Mac Offers.)