Video from Arizona
I live in Phoenix, and just saw this video of the Columbia on local KTVK Channel 3.
It was taken at Wupatki National Monument, about 30 miles north of Flagstaff on the road that leads to the Grand Canyon.
The video shown on the newscast was of surprisingly high quality for a hand held camcorder. It clearly shows what appears to be debris shedding from the Orbiter.
According to the newscast, the Arizona DPS (State Troopers) have the tape, and are forwarding it to the Johnson Space Center in Houston.