First of all, please do not show up by yourself to help. Join an organization that is experienced in disaster relief, such as Red Cross. They can help give you training. My understanding is, disaster relief is very hard work. People are overwhelmed, distressed, and sometimes recently bereaved of loved ones.
Also if you're a recent victim of Katrina, please do not fight over food and other goods, or loot, or get violent. Help anybody in need. What you give you will get. The ones you help could be Angels in disguise.
Resources to make a direct donation or volunteer your time
Red Cross:
www.redcross.org/

Salvation Army:
www.salvationarmyusa.org/USNSAHome.htm

Here is also a listing of national organizations that are active in disaster relief:
www.nvoad.org/membersdb.php

Also, here's the URL on Craig's List as I believe we should all band together to help.
www.craigslist.org/about/he..._aid.html

MoveOn's National Housing Link
www.hurricanehousing.org/

One of our members, Jackie Blue, is putting together some efforts as well:
Jackie Blue has partnered with CDBaby.com and the American Red Cross to help victims of Hurricane Katrina. All profits from CD sales will go to the American Red Cross.
To purchase the CD:
www.cdbaby.com/cd/jackieblue2

More Hurricane-Related Tribes:
katrinahelp.tribe.net
tribes.tribe.net/hurricanekatrina