Knowing more about the history and background of the setting will enrich your gaming experience. Check out these links to learn more. I also highly recommend watching Akira Kurasawa's Seven Samurai, Ran, Yojimbo and Sanjuro. Another must see is Kagemusha, especially for historical content. You may want to try adding Japanese music in the background of your gaming sessions or serving tea. It's well worth the effort.
Cha-no-yu
Geisha Garden
The Tokugawa Art Museum of Japan
Schauwecker's Guide to Japan
Nihontô - Japanese Sword
TaNizaki - Articles on Bushido and Seppuku
Tao Te Ching
A Haiku Homepage
A Book of Five Rings, by Miyamoto Mushashi
Judo Information Site 
CastleJapan.com 
 
Edo Japan, a Virtual Tour
Japan Tea
The Japanese Sword Index
Sho-shin.com - everything you need to know about swords 
The History of Japan - short and simple 
Kyudo: Japanese Archery
Naga: The Serpent - Okay, not Japanese, but this explains some of the mythos behind the Naga. I thought I'd throw this link in since some people use Naga in their campaigns. 
Japanese History: The Founding Myth 
 
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