http://old.wowace.com/wiki/AceConfig3 - Configuration dialog info

http://www.wowwiki.com/Portal:Interface_customization - Portal for all interface customisation

http://www.wowwiki.com/World_of_Warcraft_API - API list

http://www.wowwiki.com/Events_(API) - Events list

http://www.wowprogramming.com - Useful help site for writing addons