Extensions:

Transcripts.

I transcribe the comments made in the seminars, using either a laptop or my own version of shorthand. I then word process the transcript, and distribute it to the students. I have the students read the transcripts of their own class's discussion, as well as the written versions of the discussions of other class periods. The students see that they are making insightful comments, and that students in other classes are developing ideas and arguments, sometimes along similar lines, and other times in very different directions. I might assign students to comment on one or more statements made in each of the classes, or to attempt to prove or disprove claims made by other students, using the texts we are studying.

Video:

Video tape the discussion, then play back insightful comments and exchanges, both for the class in which they took place, and for the benefit of the other classes.

Audio Tape: Record the audio of the seminar. This would help with transcribing, and give students another opportunity to hear themselves being insightful, or perhaps illogical. It facilitates self-assessment.