Ninpo

Enter the Ninja
Information on various aspects of ninja discipline including on training, weapons, and kuji-in. On-line media files are available. Features video games, movies and books based on the ninja.
http://www.entertheninja.com/

Hoshin Roshi Ryu Imazuma Dojo
The Official Home Page of Hoshinjutsu Roshi Ryu. The site features information about the school as well as curriculum and photo album.
http://www.freewebs.com/hoshinjutsu/

Long Island Ninjutsu Centers
Martial Arts schools offering Ninjutsu and Jujutsu. The site also offers information about the dojo and includes a photo gallery, articles, and an online shop.
http://www.lininja.com/

Ninpeden Dojo
The Ninpiden Dojo offers training in ninjutsu, jujutsu, Japanese sword and mixed martial arts. It has locations in Elizabeth and Parker, Colorado.
http://www.ninpiden.com