Here are some interesting sites, the most detailed being the blog journal where they are entering their information like a diary.
They are also broadcasting a live video feed of the street below.
Live blog journal from the staff of
www.directnic.com
http://www.livejournal.com/users/interdictor/
Live video feed from downtown New Orleans
http://old.mises.org:88/NO2
Extensive amount of photos
http://sigmund.biz/kat/index.html
(appears down at the moment probably due to high traffic volume)
Limited amount of pictures here
http://www.darklifeimages.com/katrina/