IfItWasMyHome.com - Visualizing the BP Oil Disaster
h/t Pastor Steve Hickey at Voices Carry, where there are some good prayer suggestions as well.
I've centered the spill over Fairmont, Minnesota. This shows the top of the spill outline over Minneapolis/St. Paul and the far left of it taking in Sioux Falls and Madison, South Dakota. The lower section of the shadow is well into Iowa.
To give some idea of the size, it would take 45 minutes to an hour to drive from Sioux Falls to Madison, and a good 5 to 6 hours to drive from Sioux Falls to the Twin Cities.