I think it will be very useful to add the possibility to show the "url of the filled form page" into the emails received from the admin. In this way every web site showing services and products will know about which product and service the client is asking about. I need this functions for http://www.hotelintransilvania.com/ and many other blogs, and probably many other wordpress users too.
http://wordpress.org/extend/plugins/wordpress-captcha-contact-form-with-frontend-tinymce-editor/