I believe there is a program called "Cheese Grater" or such, that (given a regular expression) takes a normal HTML feed and makes an RSS feed out of it. I'm trying to find it (I'll ask the friend who referred me) but we could use that as a patchwork solution for sites that didn't want to convert.
Of course, this would ultimately be a patch at best; we may want to encourage converting to drupal, anyway. - Dev
