This looks interesting and useful for groups doing outreach on Katrina and environmental damage work. Also check www.scorecard.org

Link: GridSphere Portal

The GIS maps on this site depict demographic and infrastructural data as well as potential sources of environmental contamination and storm damage data in Alabama, Mississippi, Louisiana, and Texas.
Dynamic GIS information will be found in the Aerial Imagery and GIS Data Layers application.
These pre-formatted maps are intended to support the environmental health community's efforts to address the uncertainty of risk of exposure to the contaminants entering the environment as a result of Hurricanes Katrina and Rita.