Apple releases Mac OS X 10.5.5 Update

Apple on Monday released Mac OS X 10.5.5, a recommended update for all users of Mac OS X 10.5.x Leopard that includes over a hundred bug fixes and more than two dozen security enhancements.

As of press time, the 321MB update was only available via the Software Update mechanism located under the Apple menu of your Mac.
In addition to general stability improvements and over two dozen security enhancements, the update addresses issues with Address Book, Disk Utility, iCal, Mail, MobileMe, and Time Machine. A detailed list of those fixes follows:

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.