im just gonna mention this - but when u said "moving around" i hope u meant tilting it, not literally moving it from side to side... cause that would barely register any change... cause the accelerometer, i am sorry to say, measures acceleration, otherwise known as gforce, not change in position... thus if u "move around" the accelerometer from side to side, ure only accelerating for a small period of time, and thus by the time the program updates(prints out values), the value will prolly be back to the standard value, or somewhere around it... (thus u get the "around 300" on ure serial monitor)