Well, I pulled the $150 from the $50 per single-axis MEMS gyroscope I saw priced via a google search. Feel free to show me a source of actual, purchasable gyroscopes of the proper size to fit inside the already crowded case of a phone like the N900 if you like. In any case, as I've outlined...gyroscopes are largely superfluous anyway as the accelerometer can replace them in virtually all use cases you'd want with a phone (with gps and/or digital compass filling in the gaps) plus, as I've also said before, gyroscopes require occasional resetting/calibration and thus are not a "fire and forget" proposition. What is it with you and gyroscopes, anyway? You own stock in a gyroscope manufacturer?