For Your Astronomers: Solar System Scope
Link 1: Solar System Scope
The heliocentric view shows the orbits of the planets quite nicely. It is disappointing that the interface is so heavily crowded with adverts but the interactive content looks good [apparently there is a downloadable version which is free of ads but I haven't been able to find it]
You could got to this page:
Link 2: Solar System Scope
Launch Solar System Scope from that page and then make it full screen press the space bar] This way it does not have adverts.
Warning: For those wanna-be astronauts and space travelers out there, this interactive model of the solar system could prove to be highly addictive