AfriGeneas States Research Forum
[LA] SLO Document Access
Louisiana State Land Office site - with links to GIS, Historical Land Documents, Records, ...
The History of Land Titles is a very good introduction to Land Distribution in Louisiana.
In order to view some of the historical documents online, you will have to download a special software package (viewer). IF you don't mind this requirement, try some of the links under Historical Documents (Plat Books, Tax Records, State Papers, Military Warrents, etc.).
There is an online User Guide (PDF) that helps you through the process.