Several supplementary books of the Naruto series have been released. An artbook named The Art of Naruto: Uzumaki contains illustration of Part I manga and was released in both Japan and the United States. For the Part II manga, an artbook called PAINT JUMP: Art of Naruto was released by Shueisha on April 4, 2008.
A series of guidebooks for the Part I called First Official Data Book and Second Official Data Book were released only in Japan. The third databook, Character Official Data Book Hiden Sha no Sho was released on September 4, 2008, and adapted Part II from the manga. These books contain character profiles, Jutsu guides and drafts made by Kishimoto. For the anime, a series of guidebook called Naruto anime profiles were also released. These books contain information about the production of the anime episodes and explanation of the characters designs.
Great Naruto art here: