Apple has shipped tools to apply a US government-endorsed security standard to Macs.
Common Criteria Tools for 10.5 is a 103k download that Apple describes as: "An international standard that helps to ensure the security of computer systems in a network environment."
By providing an independent assessment of a products ability to meet security standards, Common Criteria gives customers more confidence in the security of Information Technology products and leads to more informed decisions.
Security-conscious customers, such as the U.S. Federal Government, are requiring Common Criteria certification as a determining factor in purchasing decisions.
Apple has published a selection of informational resources to support Common Criteria Tools, including administrative guides and white papers, most of which are available from this page on the Apple website.