Featuring a full look at all of the avatar the last airbender episodes from season 1, plus extras not included in the original boxed sets, The Collectors edition might be a good bet for many Avatar fans. The avatar the last airbender music is certainly something to listen too. As time approaches M. Night Shyamalans Live Action Adaptation of The Last Airbender set to release July 2nd there are certainly some pretty sweet products being lined up."  One i'd particularly like to mention is the Collectors edition of Avatar The Last Airbender Book 1, here is the official statement on the product.
    Relive from the beginning the epic saga of Avatar: The Last Airbender, the animated series that quickly became a phenomenon, creating a huge fan base that spans the globe! This newly designed limited edition 7-disc collector's edition includes the entire Book 1: Water compilation, packed with special features, an exclusive behind-the scenes documentary and a beautifully illustrated paperback book that provides a unique, insider's view of the amazing designs, storyboards, paintings and animation.
UPDATE: 4/17/2010 The Collectors edition is indeed going to feature the new documentary made by Kurt Matilla and Mentioned on The Track Teams Website which has a video of Jeremy Zuckerman (Composer of the original Avatar The Last Airbender Soundtrack) demonstrating some of the ways the music of Avatar was made. Features:
  • Additional Special Features
  • Behind the Scenes Documentary (Confirmed as the documentary mentioned here: Track Team Avatar The Last Airbender Documentary Jeremy Zuckerman (composer) says he thinks the Documentary is going to be awesome!)
  • Illustrated Paperback Book.
  • Release Date June 22nd shortly before The Last Airbender Film release set for July 2nd
I'd say it's a worthy addition to an Avatar fan's collection.

Try before you Buy: Check out some sweet Avatar Episodes