Here are a couple of basic stuff using the accelrometer. Feel free to add your own ideas too.
1). Accelerometer to pads with sensitivity user settings and enable-disable switch
2). Accelerometer to bipolar knob with enable-disable switch
3). The "Gravity Multiball" (accelerometer to Multiball) with gravity setting (0 disables accelrometer to ball)- this one is interesting, lay iPad flat and as soon as you move it, the Ball reacts according to gravity. I wanted to script "bouncing" off the walls but ermmmm....too hard for me lol.