Bad Behavior complements other link spam solutions like Akismet by acting as a gatekeeper, preventing spammers from ever delivering their junk, and in many cases, from ever reading your site in the first place.
This keeps your site’s load down, makes your site logs cleaner, and can help prevent denial of service conditions caused by spammers.
Bad Behavior is working in a completely different way than any other spam solution out there. Instead of merely looking at the content of potential spam, Bad Behavior analyzes the delivery method as well as the software the spammer is using.
This way, Bad Behavior stop spam attacks even when nobody has ever seen the particular spam before.
Bad Behavior is designed to work alongside existing spam prevention services to increase their effectiveness and efficiency. Whenever possible, you should run it in combination with a more traditional spam prevention service like Akismet.
Installing and configuring Bad Behavior on WordPress is very simple and takes only a few minutes. No configuration at all is needed. Simply turn it on and stop worrying about spam!
To download ‘Bad Behavior’: http://WordPress.org/extend/plugins/bad-behavior/