Add Dojo to any website with a single click of this bookmarklet.

dojo-fy.js

// based on http://www.learningjquery.com/2009/04/better-stronger-safer-jquerify-bookmarklet
//
(function() {
  var el=document.createElement('div'),
      b=document.getElementsByTagName('body')[0],
      msg='';
  el.style.position='fixed';
  el.style.height='20px';
  el.style.width='100%';
  el.style.marginLeft='0px';
  el.style.top='0';
  el.style.left='0px';
  el.style.padding='5px 10px';
  el.style.zIndex = 1001;
  el.style.fontSize='20px';
  el.style.color='#FFF';
  el.style.backgroundColor='#0092C9';
  el.style.textAlign='center';
  el.onmouseover = function() {
      this.parentNode.removeChild(this);
  };

  if(typeof dojo != 'undefined') {
    msg='This page already using Dojo v'+ dojo.version ;
    return showMsg();
  }

  // more or less stolen form jquery core and adapted by paul irish
  function getScript(url,success){
    var script=document.createElement('script');
    script.src=url;
    var head=document.getElementsByTagName('head')[0],
        done=false;
    // Attach handlers for all browsers
    script.onload=script.onreadystatechange = function(){
      if ( !done && (!this.readyState
           || this.readyState == 'loaded'
           || this.readyState == 'complete') ) {
        done=true;
        success();
        script.onload = script.onreadystatechange = null;
        head.removeChild(script);
      }
    };
    head.appendChild(script);
  }

  djConfig={afterOnLoad:true};
  getScript('//ajax.googleapis.com/ajax/libs/dojo/1.8.0/dojo/dojo.js',function() {
    if (typeof dojo=='undefined') {
      msg='Sorry, but Dojo wasn\'t able to load';
    } else {
      msg='This page is now Dojo-fied with v' + dojo.version;
    }
    return showMsg();
  });
  function showMsg() {
    el.innerHTML=msg;
    b.appendChild(el);
    window.setTimeout(function() {
      if (typeof dojo=='undefined') {
          b.removeChild(el);
      } else {
          dojo.fadeOut({
              node: el, duration: 2500,
              onEnd: function() {
                  dojo.query(this).orphan();
              }
          }).play();
      }
    }, 2500);
  }
})();

Use http://ted.mielczarek.org/code/mozilla/bookmarklet.html to turn the code above into a bookmarklet.

This works great. I changed to the latest version by changing the url to

//ajax.googleapis.com/ajax/libs/dojo/1.9.1/dojo/dojo.js