Here are some good database, etc sites for looking up quests, dungeons, etc.

http://ffxiv.gamerescape.com/wiki/
http://xivdb.com/
http://ffxiv.consolegameswiki.com/wiki/FF14_Wiki

Triple Triad info:

http://arrtripletriad.com/

Handy mini cactpot tool:

http://super-aardvark.github.io/yuryu/

FFXIV reddit:

https://www.reddit.com/r/ffxiv/