Drupal's contact form is nice by default. It sets up a page where you can enter your name, email address, subject, and message. You can also choose what category (I think of this as the department) you want to send the form to. Drupal provides a drop-down menu for the category.
Contact List module changes this a little. Instead of providing a form where you can choose what category or department, it provides a list of the categories that are links. These links will then bring you to the proper form page. When you submit the form, it will be sent to the proper department.