Was wondering if someone could make something like that. Where a user can click a link and be taken to a page where they can put in the email address of a friend. That email address will then be sent a pre defined letter that the admin can type out and save someplace in the Admin Panel.
Jay's mod is similar to this that one registration a user is sent a PM, so it could be build off of that or used as a reference, but you should consult Jay if doing so, lol.
Thanks ;)