If you want visualize just how large British Petroleums liability exposure could be from the Gulf oil spill.
This map, developed by ESRI using its geographic information systems (GIS) software, shows an up-to-date map of the Gulf coast, along with overlays showing the current size and location of the oil plume and the exact economic value for tourism, fishing and boating business for every county potentially in harms way. Economic activity is already being negatively affected in some counties.