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Site Referral Pro is a cgi program that will allow your current traffic to refer their friends to your website. Easy Installation, Online Administration, Thank You eMail, Custom eMails, Custom Redirection, Hit Counter, Multiple Friends, Error Verification. The ClickBank version is for anyone who participate in the ClickBank affiliate program! It contains an additional field for the visitor to enter their ClickBak ID! This gives your visitors the ability to make money sending their friends to your site!
Price: $14.95

Have your surfer help you advertise your site they type a friends email and then there email, then send it .it also will send the user that sent the email a thank you reply from you for using it.has error checking.
Price: Freeware

Ever wanted to get a lot more visitors to your website? Well this can help to boost your hit counter by letting your visitors to passively promote your website URL using this easy to use Perl Script.
Price: Freeware