Sites dedicated to movies about the Yakuza, Japanese gangsters, and Japaness crime films.

Guide to Yakuza Movies
A history of Yakuza and Yakuza movies including a recommended viewing list
http://www.jingai.com/yakuza/movies.html
Yakuza at Mobflix
Mobflix blogging on Yakuza movies including trailers and film clips
http://mobflix.com/tag/yakuza/
Yakuza-Eigas
A site dedicated to the world of the Yakuza-Eiga and what you need to know about the wonderful world of japanese Gangster Movies.
http://www.supertoni.ch