So this is pretty cool. http://www.phrenopolis.com/perspective/solarsystem/
It's a diagram of the solar system with the size of all of the planets and the sun to scale, as well as the distances between them. It is very rare that you see this drawn to scale (for obvious reasons if you look at it: the page is half a mile long!). I think that the distances between the planets relative to their sizes will be surprising to a lot of people.