Now here's an interesting idea; the ISP as content filter. And this after AT&T led an all-out, expenses be damned campaign to add the "safe harbor" clauses to the Digital Millennium Copyright Act that protected ISPs from just that responsibility.
Before you get too worked up reading this, remember it is just a trial balloon floated to see what happens. Still, it raises more questions than it answers and I'm sure AT&T's motive at this point is to see whether or not this could lead to angry mobs in the streets. Any less of a reaction and this might become real, but the possibilities are still slim.