I talked about Fridgets before, now Uber-Review points out Fridge Gears. They attach to your fridge with magnets, the big cog has a built in motor (and you can apparently put a photo in it too… not sure the usefulness of that), and you just set them up and go. I wonder which is more entertaining on a long time table? I feel like the Fridgets would be, but maybe having no small parts to lose makes the Fridge Gears a dark horse in this race.