Update:

The site should be highly reliable. A programmer I work with just observed:

If you read the html source for the page, you see a Javascript program
that determines whether the world has ended or not:

   <script type="text/javascript">

      if (!(typeof worldHasEnded == "undefined")) {

         document.write("YUP.");

      } else {

         document.write("NOPE.");

      }

   </script>

It also points to a feed url, so you can use your rss reader to get
updates on the destruction of the world:

<link rel=”alternate” type=”application/atom+xml” title=”Recent Entries”
href=”http://www.hasthelargehadroncolliderdestroyedtheworldyet.com/atom.xml&#8221;
/>

And, there’s a warranty in an html comment:

<!– if the lhc actually destroys the earth & this page isn’t yet updated
please email mike@frantic.org to receive a full refund –>