Right on the heels of the latest version of Safari which connected 13 security vulnerabilities, Apple has released a huge security update patching just about every part of Mac OS X. With more than 80 holes plugged, Security Update 2008-002 is a monster.
It goes without saying that you should install this one as soon as you can. This is the largest number of vulnerabilities that Apple has ever patched at once, and some of the vulnerabilities are critical. Download and install the update using the Software Update preference pane.