Looking for ways to get students to interact more with recorded lectures, course-related media, or their classmates' assignments? Vocat can help! This home-grown tool provides hosting space for video, audio, and images, and allows students to interact with those files via time-stamped annotations, threaded discussions, and rubric-based peer reviews. We'll discuss how those features can be used to generate student participation and discussion, with examples from classes that have used Vocat in the past.