uTorrent - Needed to download the torrent files of Naruto. Not the only client you could use, but probably the best out there right now.

(AonE) - Naruto 01-25

(AonE) - Naruto 26-50

(AonE) - Naruto 51-75

(AonE) - Naruto 76-100

(AonE) - Naruto 101-125

(AonE) - Naruto 126-150

As for the rest of the episodes, just do searches on sites like:
- mininova
- TorrentPortal
- BiteNova
- Torrentz - My personal favorite.

Well, enjoy 'em.