[Rhys Wynne]

If you’re familiar with ReCAPTCHA I’ve written a plugin that integrates this spam prevention tool with bbPress.

It’s still waiting to go into the SVN, but you can download it here – http://www.gospelrhys.co.uk/plugins/bbpress-plugins/recaptcha-bbpress-plugin

I’ve tested this on a 0.9 site, and it’s completely eliminated spam (since Sunday…at least!)