After weeks of developer seeds and updated releases, Apple has finally released OSX 10.5.5 to the public.  Complete release notes can be found here; however, here are the highlights

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.

Updates to Address book
Updates to iCal
Updates to Disk Utility and Directory Utility
Updates to Mail
Updates to MobileMe
Updates to Time Machine

So what are you waiting for??  Just an FYI, though… The update is about 140MB, give or take a few.  If you’re the Mac Type, then you need to fire up your ‘puter and either let it tell you there’s an update or click the Apple menu and select, “Software Update” and get all that Apple-Cinnamony goodness!