Forum Moderators: skibum
Over in the Asia-Pacific Forum [webmasterworld.com] we had a similar discussion [webmasterworld.com] just recently. If you read Bills post you will get an idea of the work involved to set up pages for the Japanese market. To be honest, I am not sure the effort would be worth it for Amazon commission. You might want to read this thread [webmasterworld.com] as well.
Onya
Woz
The Japanese audience is great for Amazon, but remember that they have their own Amazon, and it doesn't play by the .com's rules. You'd have to expect a lot of translation work to target Japan for this type of affiliate site.