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The PPC version comes in at a much lighter 198MB - provided you grab it via Software Update. The update is so large in order to accommodate a reported 35,000 file changes, which should keep Spotlight busy for a while.

The list of changes is extensive, albeit comprising Apple's typically brief explanation of the issues addressed. Automator, iCal, iChat, Mail, Parental Controls, Spaces, Time Machine and VoiceOver each get half a dozen or so fixes, while there are system-wide patches for issues ranging from Helvetica Narrow replacing Helvetica, .Mac syncing of Dashboard widgets, Spotlight searching of AFP file servers and Safari reliability when connecting to the Internet through a Microsoft ISA proxy. Time Capsule reliability is also addressed.

For more details see About the Mac OS X 10.5.3 Update.

OS X 10.5.3 is available via Software Update or from apple.com/support/downloads

Apple recommends that you backup before installation and ensure that the installation process is not interrupted, however long it may seem to be taking - make sure laptops are connected to the mains. A double restart during the installation is to be expected.

Security

OS X 10.5.3 includes the Leopard content of (Security Update 2008-003) that addresses vulnerabilities in file sharing, movie files, PDF handling printing, Flash, iCal, email and more.

Mac OS X Server

OS X Server 10.5.3 has also been released and weighs in at almost 500MB; fixes are listed in About the Mac OS X 10.5.3 Server update.

Digital Camera Raw Compatibility

Apple has also released Digital Camera RAW Compatibility Update 2.1 which extends raw file support in iPhoto '08 and Aperture 2 to include new Canon, Epson, Leaf and Pentax formats. The update is also available via Software Update.