Free whois protection at GoDaddy is available when you register 3 or more domains. As to ItalianDragon's question, people can still get in touch with you through the whois email address provided you set up your DomainsByProxy account to forward your emails. (I believe the default setting is to forward all non-spam emails, but I'm not sure about the reliability of their spam filter--i.e. if they are filtering out emails one may want. Thus, I set my account up to receive all emails.)