Userscripts.org

// ==UserScript==
// @name           news.yahoo.com cleanup
// @description    Remove navigation, ads and so on, greatly simplify
// @include        http://news.yahoo.com/*
// ==/UserScript==

/******* Other Suggestions
 * In addition to this greasemonkey script I suggest using Adblock
 * Plus, and NoScript.
 * Adblock Plus:  https://addons.mozilla.org/en-US/firefox/addon/1865
 * NoScript:      https://addons.mozilla.org/en-US/firefox/addon/722
 *
 ****** NoScript settings:
 * I personally enable the NoScript option:
 * General -> Scripts Globally Allowed (dangerous)
 *
 * So besides just installing NoScript, I also have to blacklist the
 * sites I wanted to block.  For this site that includes:
 *     - yimg.com
 *     - about:blank
 *     - yahoo.com
 *
 ****** Adblock Plus settings:
 * I use EasyList, plus the following filter for this site.  Note that you
 * have to remove the "//    " at the beginning of the line:
 */

//    /http://(.*\.(buzz\.yahoo|bc\.yahoo|yimg)\.com/)/

var item_to_replace  = $x("//body")[0];
var replace_with     = $x("//div[@class='yn-story-content']")[0];

if (item_to_replace && replace_with) {
	item_to_replace.parentNode.replaceChild(replace_with, item_to_replace);
}

function $x(p, context) {
	if (!context) context = document;
	var i, arr = [], xpr = document.evaluate(p, context, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
	for (i = 0; item = xpr.snapshotItem(i); i++) arr.push(item);
	return arr;
}