Browsing around on the internet I stumbled across a vast database of English language publications in Japan. Further investigation showed that this database is part of an even larger website, imcbook.net, which is a portal for all things in English that are printed in Japan - books, magazines, newspapers and more. There is a subscription page for magazines (many Asian business journals, for instance), lists of DVDs, short stories, poetry, links to foreign language used book stores all over Japan, and more. Check it out!

http://imcbook.net