He was an interesting guy, and one of the most popular figures in Japanese history. Whereas most samurai actually have something of a negative image here (they were upper class assholes, after all) Miyamoto Musashi has a much more positive one. Watch that video clip I linked to. It is such a famous dual that it's actually been covered by numerous movies and TV shows. That one with Toshiro Mifune just happens to be my favorite.