There are 1 previous version of this script.
// ==UserScript==
// @name CleanSidebar
// @namespace http://blog.arpitnext.com
// @description Get a clean Twitter sidebar
// @author ArpitNext
// @version 1.1
// @include http://twitter.com/*
// @include https://twitter.com/*
// ==/UserScript==
(function () {
var tags = document.getElementsByTagName('div');
for (var key in tags)with (tags[key])if (getAttribute('class') == 'bulletin yellow-box') style.display = 'none';
for (var key in tags)with (tags[key])if (getAttribute('class') == 'stats') style.display = 'none';
for (var key in tags)with (tags[key])if (getAttribute('id') == 'profile') style.display = 'none';
for (var key in tags)with (tags[key])if (getAttribute('id') == 'trends') style.display = 'none';
for (var key in tags)with (tags[key])if (getAttribute('id') == 'following') style.display = 'none';
for (var key in tags)with (tags[key])if (getAttribute('id') == 'rssfeed') style.display = 'none';
var tags2 = document.getElementsByTagName('p');
for (var key in tags2)with (tags2[key])if (getAttribute('class') == 'promotion round') style.display = 'none';
var tags3 = document.getElementsByTagName('li');
for (var key in tags3)with (tags3[key])if (getAttribute('id') == 'direct_messages_tab') style.display = 'none';
for (var key in tags3)with (tags3[key])if (getAttribute('id') == 'favorites_tab') style.display = 'none';
})();