If you never read (or didn’t know) the Security Horizon journal you are missing on the good stuff. They release their security journal every few months with some interesting articles and their summer 2007 edition was just made available today.
If that wasn’t enough, they have an article about OSSEC, written by Chuck Little, entitled: “OSSEC-HIDS: Documenting my Further Adventures in Intrusion Detection” (on page 20). Excelent read!