Eric - what you need is to start a conversation. Gather up email addresses at your meeting, and start a mailing list (topica.com makes this fairly easy).
You'll need to marshall it,but hopefully the conversation will get going.
Once you have a conversation, pick some issues, and set up a blog for each one. Invite people to join in. Escalate good postings from the chaos of the email list to the semi-permanace of the blog.
None of this will work though, unless your group contains people who can write (and think) clearly; finding them will be the hard part.
If you do find them, tell us about them, and if we like them, we'll tell our friends. It worked for Andrew...
I can't speak for Jeneane as to why , but you can comment here, but you need to do it in front of the class, on the main thread. It stops the conversation fragmenting. Layers of comments are only really needed with a much bigger group (cf slashdot, boingboing, metafilter). Doing it this way helps focus the discussion (IMO), as one is more likely to reflect before posting, thus getting closer to the ideal writing/reading time ratio.