아바타 on Nick 

Official nickelodeon site (american). It is a bit slow on the episode front, although book 3 episode released are all somewhere on the interent, this site is only up to what they have aired on television.
키워드: 아바타, avatar:the last airbender, official site, 아바타 더 라스트 에어벤더, 아바타 the last airbender