This paper presents a “persistent chat” extension to the ePresence Interactive Media webcasting infrastructure to support real-time commenting on and discussing of issues that arise during a learning event, followed by ongoing asynchronous dialogue about these issues while viewing the archives after the event. We report encouraging results of a field study of use of the system by students and a teaching assistant in a computer science class on communication skills, which encouraged students to review, think critically about, and improve their public speaking abilities.