AT&T has started selling the iPhone 4 to walk-on customers today and lines have formed again. No idea yet on what kind of volumes the stores are doing but it doesn't look light in Queens, N.Y.
Update 9:45am: Many AT&T stores have sold their inventory within an hour of opening and are taking in-store fulfillment orders or handing out tickets based on their estimated next shipment. Good luck if you're trying AT&T.