I was reading a page with content literally buried beneath flashy ads, and I really couldn’t concentrate.

This is my solution, very very simple.

1. Once: Drag and drop these bookmarklets into your bookmarks
   1. jQuerify:

      (function () {
          if (typeof jQuery == 'undefined') {
              var s = document.createElement('script');
              s.setAttribute('src', 'http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.js');
              document.getElementsByTagName('head')[0].appendChild(s);
          }
          var time = 0,
              id = setInterval(function () {
                  if (typeof jQuery != 'undefined') {
                      clearInterval(id);
                      alert('jQuery ' + jQuery.fn.jquery + ' is available.');
                      jQuery.noConflict();
                  } else if (++time == 10) {
                      clearInterval(id);
                      alert('ERROR: jQuery is not available.');
                  }
              }, 500);
      })();

   2. iToggle:

      (function ($) {
          if (!$('body').data('hidden_ads')) {
              $('iframe:visible').data('hidden_ad', true).hide();
              $('body').data('hidden_ads', true);
          } else {
              $('iframe:hidden').filter(function () {
                  return $(this).data('hidden_ad')
              }).removeData('hidden_ad').show();
              $('body').removeData('hidden_ads');
          }
      })(jQuery);

2. Any time: Execute jQuerify and then iToggle

It’s also quite safe, because you can get iframes back.

Anyway, consider the Kick Ass bookmarklet if you’re really upset.