The document discusses different technologies that can be used to match teaching messages or goals with appropriate mediums. It describes Animoto, a website that allows users to create short videos by uploading pictures and adding text and music. This medium could introduce new concepts, engage students, and initiate critical thinking. It also describes Poll Everywhere, a response system that allows testing students' preparation, engaging students, and providing immediate feedback through polls on websites or via text. Finally, it discusses Flatworld Knowledge, an open textbook platform that aims to lower costs and increase access and format choices for students through digital and print textbooks and study aids.