How to load content on different domain with jquery .load()
You can use a local PHP script to pull the external data. Then use AJAX to show it in a block.

      // ajax call to a php script
      $.post("/sites/scripts/my_script.php",
        { "post_parameter" : "post_value" },
        function(data){              
          // put the result into a div
          $('#result').html(data);
        }
      ); 


Then again if you only want to display an external website, you can use an &lt;iframe&gt;.