Several of my lists are announce-only lists that we use to send HTML formatted messages. When a message is viewed in the archives the default is to show the text version (which looks pretty bad) rather than the HTML version. Of course the viewer can click the [text/html] link at the bottom of the message, but I would like HTML to be the default. This is important to me because we are encouraging subscribers to our newsletter to use the RSS feed given continued issues with spam filters, etc.