The Mail Chimp Signup module is demo'd on this homepage. The module is AJAX powered and allows your users to instantly signup and get added to your MailChimp list that you specify in the module admin. All you need to do is enter your MailChimp API Key and Unique List ID. The styling of the module shown here is customized specifically for this template with css overrides, and cannot be used with any other template. The same module can be used on any template, but with default or other styling in its place.