FYI... As of right now it is possible to subscribe to a comment feed for individual posts. That way, you can follow any ongoing discussion on a post by post basis from your RSS feed reader. I was really hoping to set up a comment feed for the entire site, but that doesn't seem to be supported by Typepad yet. The comment feed feature itself is a new beta feature of Typepad. I had to send a note to customer support to get them to enable it on my account.
To subscribe to a feed, open the post you're interested in and click on the link in the comments section where it says "You can follow this conversation by subscribing to the comment feed for this post."
If anyone has any issues please let me know.