Infinity Book Store - Used books in the English language available throughout Japan. - http://www.infinitybooksjapan.com/
Good Day Books - New and used books, located in Ebisu, Tokyo. - http://www.gooddaybooks.com/
Tokyo Stories - Provides entertaining glimpses into the lives of foreigners in Tokyo. With excerpt and online ordering instructions. - http://www.tokyostories.net/
Mitsukatta - Shopping site holding the entire amazon.co.jp catalog. Navigate in English, Japanese, Korean and Chinese. - http://www.mitsukatta.com/
GJ*Photobooks - Sells Japanese out-of-print photography books published in the 1960's and 1970's. Based in Urawa City, Saitama. - http://www.bekkoame.ne.jp/ro/gj13019/
Amazon.co.jp - Amazon in Japan. Article descriptions are in Japanese, but account setup, shopping, and checkout available in English. - http://www.amazon.co.jp/
The Japan Page.com - Kodansha International's online book website. - http://www.thejapanpage.com/
Peek - A - Book Nook - English used bookstore in Hiroshima City. Offers book buying, selling and trading; searcheable database and online ordering. - http://www.outsider.co.jp/booknook/
Kitazawa Bookstore - Tokyo bookstore offering new and antiquarian books. Online catalog. - http://www.kitazawa.co.jp/