Well, I don't have an Arduino Mega but sleuthing through the code reveals a potential problem (maybe somebody can correct me if necessary).
Pin 9 on the Mega is Port H pin 6, which is the OC2B output compare pin for Timer 2, but the Servo library uses Timer 1.
I think you have a similar problem with the accelerometer code. It is currently set to use pin 11 for MOSI, 12 for MISO, etc. etc. but pin 11 on the Mega is PB5 which is not MOSI, pin 12 on the Mega is PB6 which is not MISO, and so on.