Windsurfers and kiteboarders have another reason to be lucky.
Now the iPhone has a very interesting application to measure wind - an iAnemometer.
This wind meter works for both 3G and 3GS and has been on top 20 of iTunes' Weather Applications for six months.
This anemometer measures wind speed by analyzing the volume of the wind on your iPhone microphone.
Then it converts the sound information into a wind speed value (Miles Per Hour, Knots, Kilometers Per Hour, Beaufort).