https://play.google.com/store/apps/d...=search_result

This app can be used to force rotation to portrait and landscape in every application and every direction (360 degrees, like iPad2).

The 360 degree rotation has improved cell reception (by rotating the antenna side skyward) in similar devices. Also, several apps have no screen rotation at all, so this one app could take care of the lack of rotation in the native Facebook app, the native Twitter app, etc.--all with a single app. Also, the phone is more convenient when you can use it from every angle, like with Opera.

Also a huge +1 on word-predictive T9 input. It's great for single handed text input, which would also be supported by the rotation app above.

MAEMO 5 style gesture swirl for zooming in and out on the N9. Woot! Also great for single-handed portrait operation.