digitalzoomstudio

This plugin creates a capcha box before your submit button in the comments section to prevent all that unwanted spam. It comes with a mini-admin panel and love.
UPDATED 1.1 
– fixed bugs 
– no more manual input of the submit button
LIVE DEMO – http://digitalzoomstudio.net/installing-magento-on-mamp/221
TWITTER – http://twitter.com/ZoomItFlash 
FACEBOOK – http://www.facebook.com/digitalzoomstudio
Check my other premium wordpress plugins here – http://bit.ly/dOenET

Comments Capcha Box

This plugin creates a capcha box before your submit button in the comments section to prevent all that unwanted spam.

Pippin Williamson

Modifies the Empty Spam action in WordPress to process the spam deletion in batches, allowing you to delete thousands or even hundreds of thousands of spam comments at once without killing your server.
Have you found a bug or have a suggestion or improvement you’d like to submit? This plugin is available on <a href="https://github.com/pippinsplugins/batch-comment-spam-deletion" rel="nofollow ugc">Github</a> and pull requests are welcome!

Batch Comment Spam Deletion

Modifies the Empty Spam action in WordPress to process the spam deletion in batches instead of all at once.

Comments Capcha Box vs Batch Comment Spam Deletion