Justin Putney at Ajar Productions has just posted an amazing Flash Extension on his Blog. The free extension adds a "MotionSketch" tool to the Flash CS4 toolbox. You select a symbol on the stage, and then draw a path with the MotionSketch tool. The path, and the variation in speed at which it is drawn, are transformed into an automatic Motion Tween. The resulting Tween path is fully editable, and the easing is editable in the Motion Editor as well. Brilliant!