Apple has just released the somewhat overdue Mac OS X 10.4.11 update as well as a somewhat unexpected 10.5.1 update. Both are available via Software Update in the Apple menu or you can download them from Apple’s Mac OS X Downloads Page. A combo-updater containing all previous updates is available for 10.4.11 (not required for 10.5.1 since there are no previous Leopard updates.)

There are also software updates for iPhoto and some of Apple’s pro apps.

• About the Mac OS X 10.5.1 Update
• About the Mac OS X 10.4.11 Update

Cautious types might want to wait a day or two and monitor MacFixit.com for possible problems before applying the updates. Or you can be like me and just charge right in, unleash the dogs of Software Update and hope for the best.