code:

// ==UserScript==
// @name           New Posts in New Tabs
// @description    Adds a button to open all threads with new posts in new tabs.
// @include        [url]http://forums.somethingawful.com/*[/url]
// @author         RedKazan
// ==/UserScript==

var forum = document.getElementById("forum");
if (forum)
{	
	var button = document.createElement("a");
	button.href = "#";
	button.innerHTML = "Open New Posts in New Tabs";
	button.style.cssFloat = "right";
	button.style.marginRight = "8px";
	button.addEventListener("click", NewPostsInNewTabs, false);

	var where = document.evaluate("THEAD/TR/TH[contains(@class,'title')]",
			forum, null, 7, null);
	where = where.snapshotItem(0);
	if (where)
	{
		where.insertBefore(button,where.firstChild);
	}
}

function NewPostsInNewTabs(event)
{
	var eval, node, name;
	event.preventDefault();
	eval = document.evaluate("TBODY/TR/TD/DIV/A[contains(@class,'count')]",
			document.getElementById("forum"), null, 7, null);
	for (i = 0; i < eval.snapshotLength; i++)
	{
		node = eval.snapshotItem(i);
		name = node.parentNode.nextSibling.nextSibling.childNodes[1].innerHTML;
		window.open(node.href,name);
	}
	
	return;
}