It's not your imagination. There's an AT&T data outage currently smiting parts of Texas, Oklahoma, and Louisiana. Yep, AT&T is headquartered in Texas, so insert irony tag here. UPDATED.
Update 2: Everything should be cool now.
Update: Here's the official blurb: "Due to a cable cut, some AT&T customers in South Texas are currently not able to access data services from their wireless devices. All voice services are operating normally, and 2G data services began to restore about 2:30 p.m. CT after traffic was rerouted."