Apple has posted updates for Mac OS X 10.5.4 Client and Server versions in addition Safari, Time Capsule/Airport Firmware and Security updates.
The 10.5.4 Update is recommended for all users running Mac OS X Leopard and includes general operating system fixes that enhance the stability, compatibility and security of your Mac.
For detailed information on this update, please visit this website:
About Mac OS X 10.5.4
The updater weights 88MB for the incremental update or 561MB for the Combo update.
The company also provides updates for Safari for Tiger to version 3.1.2 as well as Security Updates numbered "2008-004".
All updates are available either through the Software Update utility or through Apple's support web site.

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