定番の処理： $X('XPath', node).forEach(function(e) { hogehoge; });

  $X('id("files")//div[@class="info"]/span').forEach(function(e) {
     var filename = e.innerHTML;
     if (/\.user\.js$/.test(filename)) {
       var link = $X('parent::div/following-sibling::div[@class="actions"]/a', e)[0];
       if (link) {
         var el = link.cloneNode(true);
         el.href += '?' + filename;
         el.innerHTML = filename;
         e.parentNode.replaceChild(el,e);
       }
     }
  });

http://gist.github.com/1952

$x('//li[@class="song"]').forEach(function(e) {
  var hex = e.id.replace(/song/, '');
  var song_url = muxtape.ladles['player' + hex].song_url;
  var a = document.createElement('a');
  a.innerHTML = ICON;
  a.href = song_url;
  e.appendChild(a);
});

http://d.hatena.ne.jp/taizooo/20080331/1206960337