iPhoto Update 8.0.1
This update improves overall stability and addresses minor issues in a number of areas, including internet connectivity, keyword import, and slideshow export.
iLife Support 9.0.1
This update improves overall stability and addresses a number of other minor issues. It is recommended for all users of Aperture, iLife 09, and iWork 09.
AirPort Client Update 2009-001
This update is recommended for all Intel-based Macintosh computers running Mac OS X 10.5.6. It addresses issues with roaming and network selection in dual-band environments.
AirPort Utility Software Update 5.4.1
This update includes general fixes and compatibility updates for the following applications: AirPort Utility and AirPort Base Station Agent, including AirPort Disk Utility for Tiger.
You can download and install these updates by clicking Software Update from the Apple menu at the top left of your screen.