Yikes. Even if I was a big time corporation I would think twice before blocking /b/. I mean seriously. The worse that could happen is one of the suicidal freaks on there decides to take down an executive with him instead of a school. Christ AT&T, can you really be this foolish?
Here's what will happen. A HUGE fit will be raised over this and people WILL cancel their ISPs to switch to someone else. This will lose a lot of business for AT&T in a still struggling economy and they will decide to unblock. What dumbass thought blocking /b/ was a good idea? ? ? ?
Don't be sure you are so safe in Britain. If this catches on here in the
land of the free
you can bet all your marbles internet censorship will spread to you and other countries as well.