What is the actual accuracy of the Iphone accelerometer? I wouldn't think that the iphone would need particularly accurate readings of how much g force it is being subjected to so much as the ability to detect "phone is moving or not" and "phone experiencing warranty voiding levels of acceleration."

that's the beauty of apple my friend. they allways plan ahead. if you get all geeky with the iphone and ipod touch there are all kinds of hardware devices that aren't used yet. when you do download the application you have to calibrate it. the accelerometer is used mostly for games, but I've found it to be pretty accurate.