An amazing collection of images from NOAA made by a NOAA Cessna Citation aircraft [that] flew two to three missions each day only stopping to re-fuel. 

The demand for the aerial images has been astounding. From Sept. 1 – 7, about five million photos were downloaded each day resulting in more than 27 terrabytes of data being delivered to meet the intense public interest.
More links at NOAA about Katrina.