Rebuilding America’s Gulf Coast will be one of the great design challenges of the age, and last week, a group of 200 urban planners and architects held a six-day conference to discuss the direction the rebuilding effort should take in 11 Mississippi towns devastated by Hurricane Katrina. The result could be a complete rethinking of suburban design in the area, as well as a fullscale overhaul for the city of Biloxi.