The MMA7361 from Freescale is a very niceIMU sensor with easy analog interface.ط¢آ The MMA7361 Arduino is a 3.3V part and outputs an analog voltage for each of the three outputs. This voltage is in ratio to the measured acceleration and to the supply voltage (ratiometric).ط¢آ It has selectable sensitivity by dip switch. ط¢آ You will need some extra hardware to convert this analog signal to a usable digital one. ط¢آ TheArduino is really good option for it. ط¢آ This break board is especially designed for Arduino which has 3 JST connector that can be easily plug into ourIO/Sensor expansion board.