Many college classrooms these days may as well have lighted signs over their doors that read "On Air" or "Recording in Progress." A growing number of professors are recording their lectures and making them available as podcasts--regularly updated sets of audio files that students can download to their computers or MP3 players. Some campus…

The past 15 years have seen a significant increase in the use of technology in higher education. In fact, professors now find it difficult to imagine teaching without the Internet, course-management systems, Microsoft Office, e-mail, and other technological applications. Course-management systems allow faculty members to deliver materials to their…