Currently most useful FFXIV database (haven't tried the new official one yet): http://xivdb.com/

A guide to HQing from normal quality materials: http://ns.reddit.com/r/ffxiv/comments/1no9mn/the_journey_to_hqing_anything_guide/

This chart shows everything you need to know bout rare gathering nodes, including which slot individual items are located (location is always the same, so you don't need to use 300 GP node uncover ability): https://docs.google.com/spreadsheet/lv?key=0AgG_vzvZiV-RdFBOaC1DQ0dvTE9xV2VwMnhGYk1TNHc&type=view&gid=0&f=true&sortcolid=-1&sortasc=true&rowsperpage=250

A great google doc showing materia caps,very helpful when going for 318 control/347craftmanship rating needed to be able to craft 2 stars items(there's also links to caps for DoL and Fishing on the bottom) : https://docs.google.com/spreadsheet/ccc?key=0Ao8_d_IUlrTGdF85YWRTY01GZUJHRjNyMWtHZjRMWUE#gid=0

I'd also recommend: http://www.bluegartr.com/threads/118238-DoH-DoL-Leves-Dyes-Material-Tiers all the various leves for every job.

as well as: http://www.bluegartr.com/threads/118234-DoH-DoL-Class-Quests
items needed for your crafting class specific quests.

Here are other helpful sites
http://ffxivclock.com/#/
http://craftingasaservice.com/