This paper describes two pilot studies, one completed and one ongoing, that evaluate the use of Tablet PCs and a Tablet-PC-based classroom presentation system in an introductory computer science class. The presentation system, Classroom Presenter [2, 3], supports student wireless submission of digital ink answers to in-class exercises. In these studies, we evaluate the hypothesis that the use of such a system increases student learning by: (1) increasing student focus and attentiveness in class, (2) providing immediate feedback to both students and instructor about student misunderstandings, (3) enabling the instructor to adjust course material in real-time based upon student answers to in-class exercises, (4) increasing student satisfaction. The studies evaluate each of the above four parameters by means of classroom observation, surveys, and interviews.