I don't think it's wise to use the accelerometers as a way to tell whether the phone is used or not. Other things, such as the GSM chip or touchscreen, only signal activity when there actually is activity; the accelerometers are always sending data and that would have to be processed constantly to see if the phone is moving, or if it's just gravity. Not to mention, it would have to be turned on and off automatically by programs, since if I drop the phone in my pocket and walk away, I want it to suspend or at the very least blank the screen. If programs are turning that on/off when they start/stop, why not just have them disable blanking while they're running?<br>