If you follow the general RSS feed you may have noticed some spam popping up. That is because the forums are included there, and that is the one place that posts are added to the site without a moderator looking at them first.
I just activated reCAPTCHA, which will hopefully curb the amount of spam accounts that get created. The CAPTCHA will only show up on the create accounts form, so if you are all ready logged in and have an account you shouldn't see it.
In other news, when I activated the module it turned off a bunch of others. I think everything is back to normal, but if you find something out of place, please shoot me an e-mail at email@example.com.