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…

Students of Coppin State University are using a system that merges video recordings of class lectures with a digital version of the students' own notes. The system, sold by Tegrity Inc. is unusual in its use of an electronic pen along with digital recordings, with administrators and faculty members believing that the technology would improve…