I Use this
http://ui.worldofwar.net/ui.php?id=3597
It's Basic Experience Bar ... It's a great replacement for the Blizz XP bar.
Great customization as well
It works with the latest wow update just needs a TOC update. It is 2.0 BC compatible .. well at least according to the person updating it for the original author. But I have yet to have a problem with it.