asked DH who was there for 4 months recently (Katrina)
and he said:

The only one I recall is over in Metairie:

http://www.bicycleconnectioninc.com/

There's Joes, but if I remember right, they were much more specific to cruisers and low-end stuff. The Bicycle Connection is geared more toward the road crowd and more high end stuff to choose from.