I have just recently become interested in sumo. You might think that it’s just big men in diapers pushing each other around, but there is much more to it than that. The basic rules of the sport are quite simple (get the other guy out of the ring), but the history and the culture behind it are fascinating.

I don’t purport to be an expert on sumo, so I will just point out some sites that I have found useful.

Banzuke
http://www.banzuke.com
Sumo mailing list archives.

Hakkeyoi
http://hakkeyoi.net
Lots of stats.

Nihon Sumo Kyokai
http://www.sumo.or.jp
The official site for sumo stats and rikishi biographies. Also offers live streaming of bouts.

SC Group Sumo Information
http://www.scgroup.com/sumo
Includes excellent sumo FAQ.

Sumo Fan Magazine
http://www.sumofanmag.com
Good explanatory articles.

Sumo Mailing List
http://statgen.ncsu.edu/majordomo/sumo.php
List with very high traffic. Definitely subscribe if you are interested in regular updates on all things sumo!

SumoTalk
http://www.sumotalk.com