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Not only did Apple release 10.5.3 and Beta 6 of the iPhone SDK they also just released Security Update 2008-003. In traditional Apple fashion the description reads “improves the security of OS X.” As always the update is available through System Update.
Apple has just released Leopard 10.5.3 today, the update weighs in at 420MB. The 10.5.3 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.