OS X Hardening

Apple:

http://www.apple.com/support/security/guides/

NSA Guide:

http://www.nsa.gov/ia/_files/factsheets/macosx_hardening_tips.pdf

Mac Shadows:

http://www.macshadows.com/kb/index.php?title=Hardening_Mac_OS_X

Univ. Texas:

https://wikis.utexas.edu/display/ISO/Mac+OS+X+Server+Hardening+Checklist

Center for Internet Security:

http://benchmarks.cisecurity.org/en-us/?route=downloads.browse.category.benchmarks.os.unix.osx

Mac OS stigs at DISA:

http://iase.disa.mil/stigs/os/mac/mac.html

http://www.safegadget.com/30/free-security-how-to-computer-security-computer-protection-on-macintosh/

Apple's Common Criteria admin guide https://ssl.apple.com/support/security/commoncriteria/CommonCriteriaAdminGuide.pdf.

http://www.securitygeneration.com/leopard/