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.
1.0 July 7th, 2011 1.01 Zipped the file to reduce download size 1.01.1 Now the zipped file is empty. Previous upload had stuff in it. July 29th, 2011 1.02 Added a harpy farm above the floating island above the dungeon. Added an underground highway to get there (just exit through the dungeon).