I spotted this on Rock, Paper, Shotgun. http://joshworth.com/dev/pixelspace/pixelspace_solarsystem.html It is a to scale map of the solar system as if the moon were the size of one pixel. The best way to experience it is to just hold down your right arrow key and just let it scroll. Feel free to stop when you see a planet or a bit of text, then continue on. It really does do a good job of showing you the vastness of space. Just make sure you have 15-20 minutes and a lot of patience for this method. I'm feeling a bit tiny and insignificant at the moment, I think I'll lie down for a little nap.
Good hunting