The Lens lately has been providing some good insight into what's been going on in city hall regarding a number of criminal justice related issues in New Orleans. Topics include the new jail that's currently under construction, funding for the jail, police oversight, and expert suggestions (such as building a smaller jail).
Safe Streets/Strong Communities a New Orleans-based organization that's dedicated to criminal justice reform, has published a number of post Katrina reports on the social and economic conditions and costs of incarceration in the city. I read through "Big Jails and Big Costs."