A coworker of mine pointed me in the direction of an article on TidBITS by security consultant Rich Mogull that outlines some of the major security updates in Mac OS X 10.5, due out this coming Friday.

Overall, Mac OS X 10.5 Leopard is perhaps the most significant update in the history of Mac OS X - perhaps in the history of Apple - from a security standpoint. It marks a shift from basing Macintosh security on hard outside walls to building more resiliency and survivability into the core operating system.

Check out the article to learn more about the security perspectives of Time Machine, how Library Randomization will help prevent buffer overflow attacks, and several new features that will improve the overall integrity of your system.