There's an example in the vbulletin manual about using the javascript external feed to put thread links in an html page, it's basically this:
Code:
<script src="http://www.yourdomain.com/forumpath/external.php?type=js" type="text/javascript"></script>
<script type="text/javascript">
<!--
for (i in threads)
{
document.writeln(threads[i].title + " (" + threads[i].poster + ")<br />");
}
//-->
</script>
I seem to remember seeing an example that parses xml to use other types of feeds, but I can't find it now (I think it's on vbulletin.com somewhere).