Keeping your Mac locked down: a Mac OS X security primer: Page 1
Apple's approach to security can be a little bewildering at times. It's a well-trumpeted aspect of the OS, marketed in detail on the website. Mac OS X has integrated smartcard support and Apple has certified the OS under the Common Criteria guidelines; a section of Apple's developer site is devoted to the subject of security.
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I was just getting ready to post this article too. It's a good read, very informative.