Corsaire have published a downloadable white paper on making Mac OS X 10.4 (Tiger) more secure. Whilst Tiger is the most secure OS that you can get on default settings, there is more scope to prevent less risk.
Corsaire’s white paper covers everything from setting password policies to securing the firmware and is a valuable resource for Mac users in a relatively easy-to-follow format with lots of screen grabs. After reading this there is no excuse for your Mac to be one hardcore mofo.
Kudos to Slashdot.org for pointing this one out