Not only does the Oxford DNB put up regular biographies and articles for a week or a month at a time, but it also has audio files of biographies being read out loud which you can download and listen to. They seem to stay on the site for much longer. The latest one is their biography of Queen Boudicca. Scroll down to the list of biographies at the bottom of the page: they are in broadcast order, with the most recent at the top.