This add-on makes it easier to record object movements.
Real Time Animation for Blender 2.64. This addon lets you move objects and bones around in the viewport and record their motion with keyframes in real time. The time slider advances and keyframes get inserted (at frequencies that you set) when you move the objects, the addon pauses itself when you are not moving the objects. This can be used to create an animation directly, by animating in real time or in "slow motion". It can also be used to create a time sketch for your animation.
“Smooth Follow” makes an object follow your mouse pointer in a smooth trajectory. This motion can also be recorded.
The addon also has shortcuts useful for animation. There are buttons for duplicating the previous and next keyframe for location, rotation, and scaling, and a button for displaying information about keyframes located under the time slider.
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This is a paid plugin - you can download a trial version from their website.