I leave History to the Historians. These guys have done awesome work, and have helped inspire me to get moving with the long-delayed "Guide to Tokyo Jazz Spots" book..estimated arrival date, fall 2012!
http://www.allaboutjazz.com/php/article.php?id=1361
A review of "Blue Nippon" a serious and well-thought out look at the role of Jazz in Japan.
http://jazzinjapan.com
Maximum respect to Michael Pronko for his excellent site. Check here for a lot of great profiles of local musicians, recent gig reviews and some longer essays on the role of jazz in this country.
http://www.international.ucla.edu/article.asp?parentid=100868