There are 7 previous versions of this script.
// ==UserScript==
// @name Gmail Spam-count Hide
// @namespace http://userscripts.org/scripts/show/22660
// @description Hide the spam-counter in Gmail.
// @include https://mail.google.com/*
// @include http://mail.google.com/*
// @version 1.24 2010-05-09
// ==/UserScript==
/* Written 2008 by Arend v. Reinersdorff, arendvr.com
* Original version by daniel Rozenberg, http://userscripts.org/scripts/show/2210
* This script is Public Domain.
*/
GM_addStyle("span#ds_spam b, div.TO a[href$='#spam']{visibility:hidden;} span#ds_spam b:before, div.TO a[href$='#spam']:before{content:'Spam';visibility:visible;font-weight:400;text-decoration:underline;}");
GM_addStyle("div.TO.ol a[href$='#spam']{visibility:visible;} div.TO.ol a[href$='#spam']:before{content: normal;}");