This past week version 2.2 of one of our favorite free HIDS products, OSSEC, was released.  If you run WordPress, the WordPress logging plugin alone is reason enough to give the new version a look. 

References:
http://www.ossec.net/main/ossec-v22-released
http://www.ossec.net/wpsyslog2
http://www.ossec.net/main/downloads

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Jim Clausing, jclausing --at-- isc [dot] sans (dot) org