Forums for the Grievance Family

Gathering: http://www.aionproject.net/
Named mobs: http://aion.mmosite.com/guide/boss/elyos_1.shtml

Further more i use the following:

General guide: http://www.aionarmory.com/
Database guide: http://www.aiondatabase.com/
Quest guide: http://aion.mmorpg-life.com/

Thanks for the Guides!