I'm trying to protect the comments of a blog post with recaptcha. I got it to work on a custom form but when I add the re captcha content part to either the comment or blog post content item and sign out, after saving of  course, I don't get to see the recaptcha control. Public and private keys were filled in.

REcaptcha doesn't work with comments right now. Piedone and his boy friend Benedek are working on a new Comments module which could handle it.

Ok, that clarifies things. Thanks for letting me know.