recommended

// ==UserScript==
// @name        new youtube layout fixitup
// @namespace   lh.koneke@gmail.com
// @include     http://www.youtube.com/
// @version     1
// @grant       none
// @copyright   lh.koneke@gmail.com 2012
// ==/UserScript==

var a = document.getElementById("body-container");
a.style.width = "1000px";
a.style.margin = "0 auto";
a.style.padding = "0 250px 0 0";

a = document.getElementsByClassName("branded-page-v2-secondary-col")
a[0].style.position = "absolute";
a[0].style.left = "800px";

a = document.getElementsByClassName("context-data-item");
for(var i = 0;i<a.length;i++){a[i].style.width = "719px";}

a = document.getElementsByClassName("branded-page-v2-primary-col");
a[0].style.width = "809px";

a = document.getElementsByClassName("feed-item-container");
for(var i = 0;i<a.length;i++){a[i].style.width = "768px";}

a = document.getElementsByClassName("feed-item-content");
for(var i = 0;i<a.length;i++){a[i].style.width = "686px";}

a = document.getElementById("yt-masthead-container");
a.style.background = "rgba(1,1,1,0)";

a = document.getElementsByClassName("clearfix");
a[0].style.width="989px";

a = document.getElementsByClassName("yt-masthead-hh");
a[0].style.border = 0;