Check out MASHSF's site (www.mashsf.com) and go to links.
Please don't turn this into a discussion on the overall content of the site, just head straight to the links section and keep your eyes averted from the rest.
I helped them create a link project of cycling resources. Most of them are fixed gear, but there are some nice ones on there all in one place- an it's been getting pretty large. Among them are links to several Japanese Manufacturer's sites, including the aforementioned Nitto site.
Sean Flores
San Francisco, CA