gistfile1.txt

// ==UserScript==
// @name        LDR add B! button
// @namespace   http://rails2u.com/
// @include     http://reader.livedoor.com/reader/*
// @version     0.1
// ==/UserScript==

(function(){
  var w = (typeof unsafeWindow == 'undefined') ? window : unsafeWindow;
  w.entry_widgets.add('hb_add', function(feed){
    return [
      '<a href="http://b.hatena.ne.jp/add.confirm?url=', encodeURIComponent(feed.channel.link), '">',
      '<img style="vertical-align:middle;border:none;" src="http://b.hatena.ne.jp/images/append.gif">',
      '</a>'
    ].join("");
  });
})();