Make a user agree to a drupal site's terms and conditions
Came across a module that does exactly this, the Legal module. When an anonymous user registers to use a drupal site, they get presented with the normal registration form with the terms and conditions of the site below. If an administrator adds a user, the first time the user logs in, before they can go any further, they need to accept the terms and conditions. In both cases, it's just a checkbox at the bottom of the terms and conditions that they must check before being allowed to continue.