I'm in the Chicago area and my 3g/edge data has been busted since 2am. Just got to work and a coworker with an iPhone was complaining about the same thing. I hate AT&T.
Guess I'm a little late, but 3G data was down for me (even with full bars) at least from Princeton, NJ north to New Providence, NJ. Came back on at about 9:30 or so.