ATBNetworks

This site has a pretty nice demonstration of the Solar System. You can speed things up or slow them down and even go back in time to see how the planets move throughout the ages. It is slightly inaccurate since it still includes Pluto, but Pluto will always be a planet in my heart. It is also very interesting to see just how long it takes the outer planets to make a revolution around the Sun compared to the inner planets.

Site: Astro Tour