Well, it
seems to be over now, but for several hours AT&T blocked 2 boards on the (in)famous 4chan site (most notably /b/, the "random" board), causing many to accuse it of censorship and labeling this "the first shot in the net neutrality war."
http://stormen.wordpress.com/2009/07...-blocks-4chan/
http://news.cnet.com/8301-13577_3-10296152-36.html
http://encyclopediadramatica.com/ATT_Blocks_4chan
However, AT&T's official explanation on the matter is that the block was a temporary measure enacted in response to a denial-of-service attack.
http://www.crunchgear.com/2009/07/27...locking-4chan/
Either way, it should be interesting to see how this plays out.