Solar System Model

Hey Geler, I found three sites but they don't have direct computer interface with the simulator you described... They are pretty good though.

The best one I found is probably Orrery Motorized Solar System Simulator - This one clearly shows the relative orbit speeds of each planet and the relative position between each individual planet and the sun. A calendar at the base allows you to position the planets according to date, producing a model of our solar system as it is, was, or will be, on that date.
The model is gear driven with all mechanisms in the base.

You can find two more here and here.