Here is a website for people that want to offer housing
http://www.katrinahousing.org/listinfo.html
And here is the Freeper thread offering housing to those that need it. If you can help in any way including transporting a family to housing please visit.
oops here is the link for that FR thread.
http://www.freerepublic.com/focus/news/1473656/posts?q=1&&page=1