In my last Site News Post about RSS Feeds, I complained that I couldn't get Feedburner--or any other RSS tool--to work with my site. The reason, apparently, is because I had SSL turned on everywhere, including for the RSS feed. Apparently RSS feeds are only considered valid when they start with http: not https: -- I think that's idiotic, personally, since the feeds still work exactly the same way -- but it is what it is.
Well, I found a Drupal module that lets me selectively deactivate SSL in specific regions of the site. It's called Secure Pages, and with it I can turn on SSL everywhere except for the RSS feeds (technically SSL is still on, because you can access the feeds with an https: URL, but it's no longer required.)