Today, Apple released its 5th update to OS X 10.5 (Leopard).
The update is currently available via Software Update and should be available on the Apple website within a few hours.
The last update (10.5.4) was released on June 30. Apple has, on average, released an update to 10.5 every 65 days.
This update includes quite a few bug fixes and updates to Address Book, Disk Utility, iCal, Mail, MobileMe, and Time Machine. Almost all of the updates to these apps include some sort of “reliability” or “performance” fix.
If you dare to be a pioneer and install this guy right away, let us know in the comments if you run in to any issues or if you notice any particular issues that are fixed for you.