There is a wealth of demographic data available. Some of the best sources can be found here--
Statistical Abstract of the United States--Easy-to-read resource filled with demographic and business data drawn from the U.S. Census, both historic and current
Data Center--Free, tightly-focused data on New Orleans--people, business, and post-Katrina recovery. The 'Neighborhood Data Profiles' (click at top of GNOCDC page) could be very useful.
Pew Research Center--Washington, D.C. think tank that specializes in polling the trends that shape American life--demography, internet use, religion, and the press. Follow the navigation tabs at the top of their homepage to see data sets about internet use, religion, etc.