var ShiftY: Number = stage.stageWidth / 2;
var ShiftX: Number = stage.stageHeight / 2;

// number @ the end (90) is the degree's to allow object to turn
var rotationY: Number = -( (mouseX - ShiftY) / stage.stageWidth * 90);
var rotationX: Number = -( (mouseY - ShiftX) / stage.stageHeight * 90);

// Replace _screenCube with the object you wish to control	
// Lower number = faster turns
_screenCube.rotationY += (-rotationY - _screenCube.rotationY) / 12; 
_screenCube.rotationX += (rotationX - _screenCube.rotationX) / 12;

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Control your objects via mouse similar to AirtightInteractive's TiltViewer

Papervision3D - TiltViewer Style Mouse Interactions

ActionScript 3