Due to the many facets of this art, and if it's OK with Caroline, I thought I'd start a specific Ninja thread with links to sites and some of the Pagan articles that mention it.
Here's the first link, to the Museulm of Togakure Ninjutsu
Ian - Pagan Editor
"We can never obtain peace in the outer world until we make peace with ourselves."
"With realization of one's own potential and self-confidence in one's ability, one can build a better world. "