Apple has sold one million iPads since its launch a month ago, flying off the shelves twice as fast as the iPhone did when it was new. The milestone was reached on Friday, when the new 3G model of the iPad was delivered to its first buyers. Apple said today that the 9.7-inch touchscreen iPad – a new device that combines the mobility of a smartphone with the speed of a laptop – reached the million sales mark in only 28 days.