title: yql list of supported Open Data Tables
body: <p>I know there are certain apps that support Yahoo's YQL open data tables</p>
  
  <ul>
  <li>Twitter</li>
  <li>Bitly</li>
  <li>Flickr</li>
  <li>Digg</li>
  </ul>
  
  <p>etc.</p>
  
  <p>Is there a comprehensive list anywhere?</p>