Katrina Help wiki portal is good for finding or providing help:
http://katrinahelp.info/wiki/index.php/Main_Page and the new orleans craiglist Katrina help section:
http://neworleans.craigslist.org/about/help/katrina_cl.html New Orleans Metroblog is very hands-on by (former) locals:
http://neworleans.metblogs.com/ and the various links from those places. My friends are luckily on their way up, a generous friend of theirs offering to drive from IN to TN to where they are and take them to NYC. Yay for great people! Everyone else I know there has been accounted for and has someplace to go and start over. It'll be interesting to see how many decent people go back and how many just start over in other cities. It would be very sad to see the poorest and least capable people left to rebuild the city. What kind of economy will survive there? Certainly oil and gas and shipping. Tourism is screwed for a long time. Maybe some kind of WPA-like organization will be put in place to rebuild and to provide jobs. I have mixed feelings about that, but all so many want are jobs and homes.