This graphic taken from an internal NOAA document maps the oil spill's projected landfall in Louisiana for Sunday, May 2.
What it basically says is that this spill is about to hit the wetlands where it will choke marshes and destroy estuary habitat. If the spill is as bad as they say it is then the slick will expand over many weeks, months, perhaps longer.
The Gulf Coast is in trouble. This is akin to a slow motion Katrina.