FightingDirectory.info is a great resource containing links related to Chinese martial arts, Korean martial arts, Japanese martial arts, martial arts services, aikido, karate, taekwando, muay thai, chung moo doe, tang soo do and more.
Kobudo -no Ninjutsu Australia
Ninjutsu training curriculum, history, free magazine, international training centres and technique lists.
http://www.geocities.com/yowie_26
Articles, training videos, and seminars dealing with Tew Ryu Ninjitsu, an American ninjitsu system in a non-traditional program. Also sells martial arts supplies.
Sato Ryu Koga Ryu Ninjutsu. Authentic Koga Ryu Ninjutsu Instruction by the Soke of the Sato Ryu, Soke Yo Hiroshi Sato. Son of Kenneth Sato also known as Toshitori Yamashiro a Koga Grandmaster.