+David Coppoletti mentioned Ruins & Ronin to me, so I had to check it out. Apparently it was released back in 2009, though it was only just recently added to RPGNow.
Written by Mike D of Sword+1, Ruins & Ronin is chanbara-inspired white box gaming. Like Swords & Wizardry White Box, the book contains three classes (which are variations/reskins of the classes in the White Box). There is only one race other than humans, the half-ogre. The equipment and magic items in the book are Japanese themed as are many of the monsters in the bestiary. However, there's a sizable amount of the material that's already in the (free) Swords & Wizardry White Box.
I like this book. It's not historical Japan, it's samurai movie flavored rules that emulate the films. However, I'm glad I just bought the two dollar pdf. The soft cover is 11. Again, I like the book, but there's not enough new information for me to justify that price tag. There's also a lack of artwork. I think it could have been improved by some public domain classic Japanese artwork. I've read that there's a hardcover 2nd edition in the works. If it includes more artwork and material, I'll probably pick it up.
If you play white box D&D and want a Japanese spin, pick up this pdf. I don't think you'll be disappointed.