New implementation - asynchronous mode
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Loading the library
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Inline snippet:

<script type="text/javascript">
<!--//--><![CDATA[//><!--
(function() {
  var gads = document.createElement("script"); gads.async = true;
  gads.src = "http://www.googletagservices.com/tag/js/gpt.js"
  var node = document.getElementsByTagName("script")[0];
  node.parentNode.insertBefore(gads, node);
}());
//--><!]]>
</script>

Script tag with defer attribute:

<script type="text/javascript" defer="defer" src="http://www.googletagservices.com/tag/js/gpt.js"></script>

Script tag with async and defer attributes:

<script type="text/javascript" defer="defer" async="async" src="http://www.googletagservices.com/tag/js/gpt.js"></script>


Ad slot definition code
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<script type="text/javascript">
<!--//--><![CDATA[//><!--
googletag.cmd.push(function() {
googletag.slots["leaderboard_1"] = googletag.defineSlot("/AD/SLOT/DEF", [728, 90], "dfp-ad-leaderboard_1")
  .addService(googletag.pubads())
  .setTargeting("position", "1");
});
//--><!]]>
</script>


Final service API call
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<script type="text/javascript">
<!--//--><![CDATA[//><!--
googletag.cmd.push(function() {
  googletag.pubads().enableAsyncRendering();

  [... more global targeting and configuration calls ...]

  googletag.enableServices();
});
//--><!]]>
</script>


Slot display code
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<div id="dfp-ad-leaderboard_1-wrapper" class="dfp-tag-wrapper">
  <div id="dfp-ad-leaderboard_1" class="dfp-tag-wrapper">
    <script type="text/javascript">
      googletag.cmd.push(function() {
        googletag.display("dfp-ad-leaderboard_1");
      });
    </script>
  </div>
</div>