Here are some options
http://framework.zend.com/manual/en/zend.service.akismet.html
http://bad-behavior.ioerror.us/
http://antispam.typepad.com/
http://www.defensio.com/
http://mollom.com/
See: Spam Protection
Akismet was added to protect comments.
This was an easy choice because already supported by Zend Framework
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