Wind Map is a realtime depiction of surface wind speeds, created as an art project by Fernanda Viégas and Martin Wattenberg. Picture doesn't do it justice - head over and have a look.
Thx to Caleb for the tip.
On a related map note; you ever notice how Cape Cod is like a flexed arm... the shoulder is Buzzard's Bay, the elbow at Cape Mallebarre, the wrist at Truro and the sandy fist at Provincetown?? Thoreau did.