Japanese sources
Most recent summaries of Japanese economic news (from Nikkei Weekly)
The daily Asahi Shimbun in English
The daily Mainich Shimbun in English
Krugman's special page on Japan (including links to articles)
NYU page on Asian and Japanese economies
Subscription to Nikkei Weekly (Japan's equivalent of the Wall Street Journal)
Organization for Economic Cooperation and Development national-income statistics
An annotated internet directory on Japan