Been reading up on this and it's pretty much nation wide now. Florida and some other state seem to be the only ones largely unaffected. What's interesting though is from reports it seems to be mainly the DSL connections that are getting shafted. iPhones, AT&T Mobility and their faster connections seem to be unaffected at this time.
**Status Update**
Not sure on the validity of this, as does come from 4chan after all, but it appears that it isn't being censored as it is being blocked due to the high amount of bandwidth being used when the site gets DDoS'd.
"It's because the site is a constant target of DDOS attacks that were routed through AT&T servers. AT&T blocked it because their bandwidth was spiraling out of control. Spread the word. It's not about content, it's about AT&T's pocketbook."
Again, take that with a grain of salt. So far nothing is confirmed other than AT&T is actually blocking access to the site.