Here's another list worth keeping your eye on called the Thugburg list. It's not comprehensive, but it does cover other islamist groups besides al Qaeda. Unfortunately, as far as I can tell, it's only updated about once a month.
Also, watch out for spelling variations in these thugs' names. Don't know if that's a deliberate deception or if something has been scrambled in the translation, but it makes it a little harder to keep track of 'em.