Apple released a new OS X update today. Mac OS X 10.5.3 Update is recommended for Mac OS X 10.5, 10.5.1, and 10.5.2 Leopard.
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The new OS X update includes general operating system improvements that enhance the stability, compatibility, and security of your Apple computer.
The update affects Mac OS X 10.5, Mac OS X 10.5.1, Mac OS X 10.5.2, Mail, iChat, iCal, and AirPort.
More details on the Apple Support site.