Will you be there for only a couple days? What would you like to do?
I have been involved with a volunteer camp in Slidell (across bridge to east of NO, they have projects going several places in and around NO.
bayoulibertyrelief.org Niki and Ken.
Animal Rescue New Orleans needs people very much, drive around and fill animal food/water stations, or work in the warehouse. They do need help, are very good people and are glad to have anyone help for any amount of time.
http://www.animalrescueneworleans.com/"(07/27/06) Volunteers urgently needed to feed and water animals. Residents and out-of-towners desperately needed. Warehouse animal care needed: Morning shift at 8am, and afternoon shift 6-9pm. Call 504-571-1900 or just show up!"
Common Ground can always use people mucking houses, etc.
http://www.commongroundrelief.org/Are you part of a church as many have projects going also. Habit for Hummanity is working there, not sure if they take weekend volunteers though.
Hope this helps a little. Sorry, know nothing about housing, but any of these organizations might. Have a good time, thank you very much and please let us know how it went.