Almost everything you'd want or need to know.
FFXIV Wiki @ Gamerscape

A good place for Dungeon, Crafting, and Gathering guides.
FFXIV Guild

Gardening database.
FFXIV Gardening

A tool to figure out what to feed you choco to get the color you want, the 1st time!
FFXIV Chocobo Colour Calculator

Please reply with any favorites you have.