And finally: Having a gyro makes VERY LITTLE real-world difference. Instead of worrying about that, rather practice making panoramas!
Windows Phone 7本身已有'Motion' API, 即使沒有Gyroscope的硬件下, 也能利用Accelerometer和Compass的資料來計算出Gyroscope的相關數據!
Microsoft has given developers a fancy 'Motion' API which will combine the readings from the accelerometer, compass (not mentioned above, but included in most WP7's), and gyroscope and return very easy to use information about the phone's motion. It even goes so far as to compensate for the lack of a gyroscope by combining the other two values as best it can when a gyro is not present. And it turns out that their compensation works pretty well!