As of 8:45 AM, the time of this post, AT&T's data network has been down for at least 2 hours. I have no idea why or how long the outage will last. I also don't know where it's out at, but I do know I have no data connection in Philadelphia. If it's still out by lunch, I may try to call them. In the meantime, I'm glad I have a backup Verizon BlackBerry, as Verizon's network is working. I checked with other AT&T users around the office, and nobody has a working data connection at this time.