I've been slacking! In no particular order:
Alerting on DNS Changes - Daniel Cid
Leveraging Community Intelligence - Michael Starks
Mapping OSSEC Alerts with Afterglow - Xavier Mertens
Detecting Defaced Websites with OSSEC - Xavier Mertens
Five Tips and Tricks for OSSEC Ninjas - Michael Starks
Week of OSSEC Roundup - Daniel Cid
You Got Your OSSEC in my Logstash
You got your OSSEC in my Logstash Part 2
If I missed something, let me know!
It's not really 3WoO related, but BSD magazine has an OSSEC on OpenBSD article.
Someone made an ossec reddit.