A Visual Guide to Our Solar System
Everyone else is linking to this -- I think I saw it at SF Signal first -- so I'll join the horde.
It's a big image, with "All (known) Bodies in the Solar System Larger Than 200 Miles in Diameter."
From it, I was reminded (I'm going to pretend I already knew this) that Ganymede and Titan are larger than Mercury, that five other moons and the new dwarf planet Eris are larger than Pluto, and that there are a heck of a lot of "Trans-Neptunian Objects."
