A place for everything and everything in it's place.
This map has sections for all of the various things that you find in Terraria.
Here's a link to the first forum post about this project when it was a work in progress: http://www.terrariaonline.com/threads/a-place-for-everything-and-everything-in-its-place.28559/
Since then I've added a P for potions and a M for materials.