Here are some tips I've found that make dealing with OSSEC rules easier.
May 17th and 18th - two days and three tracks of information security goodness!
Manage Your ASSets: NMAP Automation
I have automated, weekly NMAP scans that run, compare the results against the previous week's scans, and email me with what has changed on my network.
Security MBA: May 7
For up-to-date security news, conversation, and beer; come enjoy this month's Security MBA, May 7.
OSSEC & Splunk: SIEM for Everyone
OSSEC combined with Splunk is a free and worthy SIEM solution. Here is an overview and high level guide to getting it up and running.