iBowl is a fun, free bowling simulator that makes excellent use of the iPhone and iTouch's movement sensors. iBowl's simple and intuitive interface shows you looking down a bowling lane at a set of pins. You just drag your ball left or right to position it, hold down the "Bowl" button, and then swing your arm forward and back as if you were actually bowling to release the ball and determine its speed. iBowl has some fun extras like the ability to choose your ball color and send your score to a friend, but the gameplay alone is enough to make this a fun and addictive way to kill some time. Be careful, though; since you have to keep one finger on the centered Bowl button, make sure you don't accidentally throw your device down the virtual alley.