does apple require applications submitted now (after 3.0) to conform only to 3.0 SDK? i realized that my willAnimateRotationToInterfaceOrientation:duration was not recognized in OS 2.2.1, so i "downgraded" to the previous willAnimateSecondHalfOfRotationFromInterfaceOrientation:duration. when running, this message appears in the console Code: Using two-stage rotation animation. To use the smoother single-stage animation, this application must remove two-stage method implementations. could i perhaps somehow poll the device for it's OS and use the method which is more appropriate? if so, how could i do that?