I remember the thread. Theres loads of options online.
This is a good comparison guide, just copy and paste the pictures and info.
http://www.sciencenetlinks.com/interactives/messenger/psc/PlanetSize.html
Theres also various videos on youtube which sort of zoom out from the planets.
You think thats scary, go and see this..
http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/