Net-security.org has a story (scroll down on the page) about making a secure Linux system. Among the bits of advice: "Good partitioning does a lot of good to your system, to it's security
as well as it greatly simplifies your admin duties in case of a system
crash and data recovery. That way you can create various partitions, and have them set
as read-only, nosuid or similar."
April 19, 2001