I ran across a problem with RSS support in the default Wordpress installation: The RSS (and RSS2, Atom) feeds were being given URIs of the form feed://. Apparently this is a new style way of denoting feeds that is being implemented in some RSS readers. Unfortunately, Firefox didn't recognize it, and neither did (one of) the RSS readers I use (Habari Xenu). The fix was just to remove the feed: prefix from the URIs.

To adjust this, just edit the footer.php file, which can be found in the theme directory, for example:

       /blogroot/wp-content/themes/default/footer.php

Remove the "feed:" strings from this file and all should be well again.