I read the tutorial about add reCAPTCHA to Contac Form page at: http://www.webdesignideas.org/2009/12/05/adding-recaptcha-custom-contact-form-page-wordpress/
The first step has been successful I have seen reCAPTCHA on contact form page, but I had trouble in the second step. reCAPTCHA that I plug is not working. I do not know how to add reCAPTCHA verifier on Contact Details plugin.
I use Contac Details plugin.