List of anti-spam plugins to Wordpress http://wordpress.org/extend/plugins/jsspamblock/ http://wordpress.org/extend/plugins/wp-ban/ http://www.akismet.com/ http://unknowngenius.com/blog/wordpress/spam-karma/ http://www.homelandstupidity.us/software/bad-behavior/ http://wordpress.org/extend/plugins/simple-trackback-validation/ http://wordpress.org/extend/plugins/jsspamblock/