here are some fansites that i know about

[Hazlenut Tree-breeze]

www.avatarchapters.com
www.avatarworld.org
www.avatarspirit.com
avatarfansites.itopsites.com
www.musogato.com/avatar
www.dongbufeng.net
www.avatar-forums.com
kataangforever.net
www.water-bender.com
www.breakthrough-designs.com
www.avatarmasters.finessedreams.com
www.theavataronline.com
www.gyatsostemple.com
avatar.wikia.com/wiki/Special:Categories