I've just released a new app called Orientation Control that locks the phone's orientation. This is not just simply disabling the phone's auto rotate sensor, but it actually forces the phone to stay in that orientation mode. It supports both Landscape and Portrait mode.
Also, it does not require root.
Here is a brief description of the app:
Orientation Control serves two main purposes:
1. As an orientation lock
2. As an easy to access orientation switch shortcut. No more going through the long process of opening Settings > Display to change your orientation!
Orientation Control can lock the orientation to FOUR modes:
2. Portrait (Same as disabling auto rotate in phone's settings)
3. Forced Portrait (Always in portrait regardless of app!)
4. Auto Rotate
It is currently listed for $1.49 on the android market.