Check out this trailer from an early build of the European (pre-PS Move, even pre-PS3 Slim) version of EyePet
You could scan drawings in and then control them in game. The pet even interacted with the drawings on-screen.
Kung Fu Live uses skeletal mapping to judge where your limbs are so that you can fight using punches and kicks in game, as well as move using gestures. The system knows the shape of your body, and edits out all the people and objects around you leaving just yourself on-screen.
Of course Kinect has a 3D sensor which makes this kind of control easier to implement, but it isn't really as new as Microsoft and the media are making out.
Thing is, most parents and little kids will have never played or heard of the EyeToy. PS3 and PS Eye can do most of what Kinect can do, but Kinect is being packaged and marketed well.