Here is a huge list of links to the situation regarding Hurricane Katrina and her aftermath.
I lived in Missouri during the flood of 1993 and my wife and I helped with sandbagging efforts in the little town of Hartsburg, Mo. (25 miles south of Columbia and just north of Jefferson City). I was impressed by the 6+ foot tall wall of sandbags we helped build in the middle of town that held back the Missouri River. I also recall levee breaks that occurred on the Muddy Mo. But sitting up here in relatively safe South Central Minnesota, I can't imagine the devastation down in Mississippi and Louisiana.