Just an idea, something that I would like in particular are a bunch of comparisons on Linux security features in terms of their theoretical security, performance impact and ease of use. A lot of Linux deployments may use SElinux, Apparmor or the less used Grsecurity package. Which of their features make sense, with what (server) loads, which don't and cause unnecessary overhead.
Security considerations for your public facing web- or mailserver, SSL and CA options (even what you used for this site). Key management practices in home environments.
Self hosted cloudyness for the more paranoid or celebrity STH readers.
Secure remote backups / Secure backup strategies.
But all in all with a home focus. So no $20k SSL offload cards