After much deliberation, I have decided to create a Feedburner feed for the podcasts. As I mentioned below, the podcasts themselves will be hosted at Libsyn, which supplies the rss feed. But Todd suggested Feedburner in anticipation of the possibility that someday those podcasts would move to another host, either because I move all of my operations to a single host (rather than having blogs on Typepad and podcasts on Libsyn) or because Libsyn doesn't survive past this initial development of the podcasting market.
I must say, though, that I am concerned by the possibility of Feedburner going out of business, and I believe the feed will displays ads, which may cause me to rethink this before the launch next Tuesday. My subscription doesn't show anything yet ... apparently, it's waiting for me to post my first podcast. But I think Feedburner makes whatever money it makes via advertising,
The main advantage of Feedburner is that I can change the underlying feed while keeping the Feedburner url constant. I also like the nice page that displays when you click the feed, which is so unlike the usual code that pops up when people click feeds. But if you have any thoughts about the merits (or de-merits) of Feedburner for the purposes I have described, I would certainly be interested in reading them in the comments.