Quickly after the hurricane Katrina disaster bloggers started posting messages and photos to the web and special web-pages were set-up for exchanging information.
People who live or happen to be in the disaster-area tell first-hand stories, show photos of the scene, or give practical information like maps, lists of survivors.
Metroblogging New Orleans
A list of where people are and how to contact them
The Hurricane Katrina photo pool (flickr)