Heres a list of websites with information/guides. Ill update it as new stuff come up. Feel free to post a guide for me to add.

ChannelOne (http://www.channelnone.com/Rappelz/) Info on Skills, Classes, Races, Items, and creatures.
Official Websites Guide (http://rappelz.gpotato.com/gameguide/player_guide.php) Official Rappelz website with info on Community, Enhancement, and PKing rules.
MMOSite's Guide (http://feature.mmosite.com/rappelz/guide.shtml) Info on keyboard commands that can also be found on officail website
Rappelz Creature Guide (http://www.tabemashou.com/games/rappelz/creature_redpixie.html) The best creature guide out at the moment