Two books worth a read on the subject:
"A.D.: New Orleans After The Deluge"... One of the most unique - and compelling - books written in response to Katrina is Josh Neufeld's non-fiction graphic novel - a New York Times bestseller - which is just out in paperback. Buy it .... you'll love it.
By the way .... check out Octavia Books in New Orleans ... they're on FB and have great website:
One helluva local bookstore ... with New Orleans literature ... and much more.