If you’re interested in astronomy or have a kid that’s learning about the solar system in school, this 3D, interactive, Flash-driven model of the solar system can be really cool. You can check out the constellations with the Panoramatic view, zoom in on planets with the Heliocentric view, and focus on Earth with a Geocentric view.
You can perform a search for the heavenly bodies or zoom in and drag the objects around with your mouse. You can also change the date to see where objects were or will be. The settings are pretty customizable.
Go check out www.SolarSystemScope.com to begin your space exploration.