Dramatically reduce comment spam on your blog without using a captcha.
Self-descriptive I think. My support query is still outstanding.
The plugin does identify 99% of spam coming to my site, sending it all to the spam folder. But it operates before WP has applied my specific anti-spam rules, so I now have to wade through more spam than before because nothing is being automatically deleted. The only saving grace is that it doesn't fill my email inbox.
No options, so you can't really know if it's working or not, but it's just useless anyway... in 2 days it didn't manage to block a single spam message!