If you can't wait for The Last Airbender movie release you may want to read a prequel to the movie, a new book is being released May 18 called Zuko's Story - A Prequel. The thing I find most intriguing about this book is that it is set before events occur in the first season of Avatar, and it features my favorite character (Zuko) so it should be a pretty interesting read."  The Artwork of Zuko on the cover is pretty sweet too.

UPDATE: 5/12/2010 - MTV Just got an exclusive look at the upcoming Comic, Check out a Sneak Peek at Zukos Story a Prequel [caption id="attachment_913" align="aligncenter" width="300" caption="Zukos Story a Prequel New Avatar The Last Airbender Book - (out May 18th Priced at $8.79) "]Zukos Story a Prequel Avatar The Last Airbender Book[/caption] Read the official description of the book:
Prince Zuko is banished from the Fire Nation by his own father, Fire Lord Ozai. Horribly scarred and stripped of everything he holds dear, Zuko wanders the earth for almost three years in search of his only chance at redemption: the Avatar, a mystical being who once kept the four nations in balance. All around him, people whisper that this is an impossible task—the Avatar, after all, disappeared a century ago—but Zuko defiantly continues the search. His quest is all he has left.
As you can see it looks like it goes more into depth about Zuko's banishment from the Fire Nation by his father, Fire Lord Ozai.

[caption id="attachment_914" align="aligncenter" width="293" caption="Zuko spoke out against the Fire Nation Councils plans to sacrifice Fire Nation Soldiers, angering the council"]Young Zuko Arguing Fire Nation Council[/caption] Zuko was banished with the only way to reclaim his position in the Fire Nation being to capture the Avatar

[caption id="attachment_915" align="aligncenter" width="293" caption="Firelord Ozai, Zukos father, fought Zuko in an Agni Kai (Fire Duel) Permanantly scarring Zuko, and then banishing him from the Fire Nation to hunt for the Avatar."]Firelord Ozai Shadow[/caption] The book should be fairly interesting and can clear up some loose ends about what happened to Zuko before we first see him already banished, it'll hopefully also cover Iroh's history more as well. [caption id="attachment_916" align="aligncenter" width="201" caption="Zuko begins The Last Airbender in a mad hunt for the Avatar to restore his honor. The book begins years before that point."]Zuko[/caption] You can currently pre-order the book at Amazon for $8.79 the book is set to release May 18th.