Yes, I've been gone for a while. Anyway, Steve over at Triablogue just posted a great review of Cardinal Dulles' book on the Magisterium. He also posted a reply to a Catholic commenter who threw out all the old Roman Catholic philosophical arguments for high-church authority. [My replies to those arguments are found here.]
UPDATE: Steve continues to review Dulles' book on the Magisterium. Here, he deals with the typical Roman Catholic spoof-texting to "prove" that the New Testament taught Roman Catholic ecclesiology.