<h2>Photos</h2>
<p>
  <script src='http://www.google.com/jsapi' type='text/javascript'></script>
  <script src='http://www.google.com/uds/solutions/slideshow/gfslideshow.js' type='text/javascript'></script>
  <style type='text/css'>
    .gss a img {
      border : none;
    }
    .gss {
      width: 180px;
      height: 180px;
      color: #dddddd;
      background-color: #fff;
      padding: 5px;
      border: 1px solid #eee;
    }
  </style>
  <script type='text/javascript'>
    function load() {
      var samples = 'http://demo.phtagr.org/explorer/media/media.rss';
      var options = {
        displayTime: 2500,
        transistionTime: 600,
        scaleImages: true,
        fullControlPanel: true,
        linkTarget: google.feeds.LINK_TARGET_BLANK
      };
      new GFslideShow(samples, 'slideshow', options);
    }
    google.load('feeds', '1');
    google.setOnLoadCallback(load);
  </script>

  <div id='slideshow' class='gss'>Loading...</div>
</p>

I wrote a small WordPress gSlideShow widget plugin (based FlickrRSS) on  which embeds your Media RSS to your blog (download). Enjoy!