I've written about how my DynamicOrientationChanges classes improve the user experience for Windows Phone 7 applications by animating device orientation changes. For "in your face" transitions, there's AnimateOrientationChangesFrame which animates the rotation interactively (but might get bogged down by complex layouts). For more subtle transitions that perform smoothly regardless of how complex the page layout is, there's FadeOrientationChangesFrame which fades between the before/after layouts. Both classes have the same API and both are used in the same manner - it's just a matter of choosing the right one for your scenario.
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