Apple has released OS X Security Configuration Guides for Max OS X v10.5 (Leopard), Mac OS X v10.4 (Tiger) and Mac OS X v10.3 (Panther).
The guides "provide an overview of features in Mac OS X that can be used to enhance security, known as hardening your computer."
Apple posts a warning with these guides:
"To use these guides, you should be an experienced Mac OS X user, be familiar with the Mac OS X user interface, and have at least some experience using the Terminal application’s command-line interface. You should also be familiar with basic networking concepts.
Certain instructions in the guides are complex, and deviation could result in serious adverse effects on the computer and its security. The guides should only be used by experienced Mac OS X users, and any changes made to your settings should be thoroughly tested."