Massachusetts Institute of Technology has many excellent resources that are available through their Open CourseWare platform. The attached lecture slides and video are useful for explaining to students what kinds of things computer scientists do both professionally and in practice.
What Computer Scientists Do Slides
What Computer Scientists Do Video Lecture
Change.org is trying to organize a petition in every state to make Computer Science a graduation requirement. CSTA is supporting this movement, and you can participate by following the link below. If you need help making the argument for computer science in your school or district, check the Resources page for presentations and white papers that can help you formulate your case.