Naruto

12 years ago a great and powerful nine-tailed demon fox started to rampage on a village destroying everything in it. The village's best ninjas tried to stop it, but the demon fox was too strong. Then their hokage, which is THE best ninja sealed away it's spirit inside a new-born child and with that the hokage passed away. The child who had the demon fox sealed in him ia named Uzumaki Naruto. Naruto wants to become the best hokage in the Konoha village but dosen't know that the curse of the demon fox is sealed within him. Throughout this anime you see him and many other characters try to become the greatest ninjas in the village and fight off villians of the story.

Oh man, this anime ROCKS THE NINJA WORLD!!! Naruto rocks, all the others rock, the action, comedy, adventure, suspense, drama, it'a got all the goods and so much more!
Naruto has NOT been english dubbed, but is fan subbed so you can find the episodes in places like NarutoFan.com and other Naruto places. The manga is available and also is in Shonen Jump.
It's still going on in Japan and reached to episode 102, and rumors say that it's going to be as long as Dragonball Z!