ear1grey

NOTE: Worst Offenders for WordPress 2.5 is currently a pre-alpha release for developer feedback only.
If you use any anti-spam tool you will no doubt be delighted that spam can be automatically identified, but less happy that you now have to either trawl through the spam to check for false positives, or just give up and hope for the best – this is where Worst Offenders can help: it analyses messages already marked as spam and uses several techniques to identify messages with common sources, subjects and content – those which are definitely spam. These Worst Offenders can be deleted en-masse, hopefully leaving just a handful of messages that can be checked by hand.
<h3>To do</h3>
Switch to using wp_cache wherever options were used 
Improve count function to remove duplicates

Worst Offenders

NOTE: Worst Offenders for Wordpress 2.5 is currently a pre-alpha release for developer feedback only.

Silkalns

WP Chill

Cristian Raiber

A very useful plugin for everyone using WordPress. Adds reCaptcha security to the WordPress login form, register form and comment form. This plugin could help your blog get rid of a lot of spam comments or brute-force attacks.
Nothing gets passed it if the reCaptcha doesn’t validate.
A few notes about the plugin:
<ul>
<li>Supports audio or image captcha types</li>
<li>Can generate the reCaptcha image / audio type in a number of predefined languages</li>
<li>Adds reCaptcha protection to the WordPress login form</li>
<li>Adds reCaptcha protection to the WordPress register form</li>
<li>Adds reCaptcha protection to the WordPress comment form</li>
<li>Adds reCaptcha protection to the WordPress recover password form</li>
</ul>

Uber reCaptcha

This plugin adds the reCaptcha form to the WordPress login form, recover password form, register form and comment form.

Worst Offenders vs Uber reCaptcha