Animus Tell a Friend

This script lets you put a form on your web page that your visitors can use to recommend your site to their friends. It can be configured to send a thank you note when it is used, and can also send an e-mail to you when it is used so that you know it's being used. You can even change the colors or use a .css file so as to match your site's look. All setup is done through as easy to use web interface, so you want have to mess around with a text editor. To prevent it from being repurposed by spammers, the script can be set to only work once per IP address for a certain amount of time, defined by you.