The Archdiocese of New Orleans historic records from the St. Louis Cathedral
Lousiana State Archives Confederate Pension Applications Index pension applications from soliders or their families
Notarial Archives’ Research Center and Historical Documents of the Orleans Parish Civil Clerk with online indexes for the French Colonial records and the highly important Notarial Records are near the bottom
New Orleans Public Library: Louisiana Division, City Archives and Special Collections including the Louisiana Biography and Obituary Index (1804-1972) and New Orleans Justices of the Peace Marriage Records (1846-1880)

Also see links for The South