I haven't bothered shading mine (I don't submit anyway) but surely Johannes deSilentio's solution is wrong - he shows no coastline at all for the south-west states. Re Texas and New York, TX coastline would include the U to the right of it, and NY has the corner of the A between NJ and CT. That's my take on it anyway. Not including MN was a niggle but all very clever and, in the end, enjoyable.