only google, fast, wisenut and hotbot
why? because!
filter -".com"
no com sites whatsoever, will loose 0.4% signal, gain a lot
filter "antipopup"
A typical popup script:
<script language="JavaScript">
<!--
function open_window(your_page)
{
var popup_height=400;
var H = (screen.height - popup_height) / 2;
var popup_width=500;
var L = (screen.width - popup_width) / 2;
pop_up = window.open(your_page,"Popup","status=yes,scrollbars=yes,resizable=no,height="+popup_height+",width="+popup_width+",top="+H+",left="+L);
}
-->
</script>
so if window.open is there... ditch result!
window.open seems responsible for 88% of the popups
also document.open and window.onunload
also onload="top.window.focus()?
also self.focus()?