There are several regional message boards where people can post the names of the missing, as well as get out word that they are safe and where they have evacuated to.
Many are associated with local newspapers, and cnn has one as well
try these:
http://forums.sunherald.com/n/mb/lis...r-biloxkatrina
http://www.nola.com/forums/searching/
http://208.137.136.144/phpbb2/index.php
http://www.cnn.com/SPECIALS/2005/hurricanes/list/
http://kenburtonne.web116.discountas...na/Status.aspx
Here is the official gov site listing most resources
http://www.firstgov.gov/Citizen/Topi...loved-ones-vgn