There are 3 previous versions of this script.
// ==UserScript==
// @name Wikipedia SOPA Remove Blackout
// @author wikked
// @namespace http://wikked.info/userscripts/wikipedia-sopa-remove-blackout.js
// @description Remove the Wikipedia SOPA Blackout screen
// @license Creative Commons Attribution License
// @version 0.3
// @include http://wikipedia.org/*
// @include http://en.wikipedia.org/*
// @include https://wikipedia.org/*
// @include https://en.wikipedia.org/*
// @match http://*.wikipedia.org/*
// @match https://*.wikipedia.org/*
// @released 2012-01-18
// @updated 2012-01-18
// ==/UserScript==
var headElement = document.getElementsByTagName("head")[0];
if (headElement)
{
var styleElement = document.createElement("style");
styleElement.type = "text/css";
var css = "#mw-sopaOverlay { display:none!important; } "
+ "#mw-page-base { display:block!important; } "
+ "#mw-head-base { display:block!important; } "
+ "#content { display:block!important; } "
+ "#mw-head { display:block!important; } "
+ "#mw-panel { display:block!important; } "
+ "#footer { display:block!important; } ";
styleElement.innerHTML = css;
headElement.appendChild(styleElement);
}