Discover iPhone 4's Gyroscope with Gyro Draw
Seattle-based Candywriter today released Gyro Draw 1.0 for iPhone and iPod touch, a sketching app designed for iPhone 4 owners. Users select whether they would like to sketch via the accelerometer or the gyroscope and then choose a type of graphing paper. Tilting the phone left or right in Accelerometer mode allows the user to drop a pencil around the screen towards gravity. Gyroscope mode, on the other hand, measures device rotation to slide a piece of paper about the pencil.
http://prmac.com/release-id-14388.htm