I just got some more information and links, and decided to share it here for anyone interested.
For a comprehensive listing of mail interruption, see this site - it tells you what areas mail will not be accepted for due to the hurricane:
http://www.usps.com/communications/news/serviceupdates.htm If you want to volunteer to help, check this list of groups:
National Voluntary Organizations Active In Disaster:
http://www.nvoad.org The Federal Emergency Management Agency's contact info: Phone: 1-800-621-FEMA
http://www.fema.gov/ FEMA Emergency Contact:
http://www.fema.gov/fema/statedr.shtm The FEMA Charity tip list, so you can avoid fraud:
http://www.fema.gov/rrr/help2.shtm The Better Business Bureau list of approved charities:
http://www.give.org/news/katrina.asp Web sites offering disaster relief information:
Louisiana Homeland Security
http://www.ohsep.louisiana.gov/ The City of New Orleans
http://www.cityofno.com/portal.aspx The Louisiana Governor's Office
http://www.gov.state.la.us/ Catholic Charities, 1-800-919-9338
http://www.catholiccharitiesusa.org National Voluntary Organizations Active in Disaster
http://www.nvoad.org Louisiana Society for the Prevention of Cruelty to Animals
http://www.la-spca.org Louisiana State Emergency Organizations:
Louisiana Office of Homeland Security and Emergency Preparedness
Phone: 225-925-7500
Fax: 225-925-7501
http://www.ohsep.louisiana.gov Louisiana Office of Emergency Preparedness
7667 Independence Blvd.
Baton Rouge, Louisiana 70806
Phone: (225) 925-7500
Fax: (225) 925-7501
http://www.loep.state.la.us