A year after Hurricane Katrina hit the Gulf Coast, the homeowners-insurance market has been remade into a world of winners and extreme losers. Skyrocketing insurance rates in Florida are panicking homeowners, quashing real-estate developments and hobbling businesses. Some commercial and condominium rates have risen 400% or more. Louisiana officials fear the higher cost of insurance in southern parts of the state will slow or derail rebuilding efforts. Many of the state's remaining insurers are imposing 5% windstorm deductibles or refusing to cover wind damage at all.