Astrojax
The Astrojax: 3 balls on a string. The possibilities of play are limitless, and 2 hours will feel like 5 minutes when you're playing with it. Fits in your pocket, and just like the yo-yo, it is an ideal entertainment for waiting in public transport! :-).
CD-ROM to learn the Astrojax discipline
CD-ROM with about thirty Astrojax tricks. Ideal for beginners.