For those who use wind energy, and for general kite-flying purposes, it'd be nice to know where the wind in the United States is at any given moment. With this real time wind map, you can!
This beautifully rendered "personal art project" uses wind data from the National Digital Forecast Database and displays all the current wind patterns in the United States. The map comes complete with statistics like "top speed" and "average speed."
Though your average user probably won't have much use for it beyond general interest, but it is both kind of memorizing and oddly beautiful.
And if you do happen to use wind power, it's a fine resource.