Anti-spam Pro plugin blocks spam in comments. Anti-spam Pro is powerful and extended version with settings of free and popular Anti-spam plugin – http://wordpress.org/plugins/anti-spam/
Anti-spam Pro ver.2.0 released with more powerful spam protection.
Anti-spam plugin blocks spam in comments automatically, invisibly for users and for admins. No captcha, because spam is not users’ problem. No moderation queues, because spam is not administrators’ problem.
More info at – http://web-profile.com.ua/wordpress/plugins/anti-spam-pro/