This great site is by the folks that brought you Bearers of Jade. They have a great adventure along the same lines, with more stuff to follow. They also have some great articles on Roleplaying in general. This is a page that covers all aspects of Rokugan. This expanding line of Feudal Asian terrain is great to see.
Many projects are detailed and pointers abound.
This site is constantly updated. There is also a message board with reader's tips, etc. Now in their new home at the Warhammer Players Society. A site with some great scenery links. This site has sketches of the various feudal Japanese buildings they have available.