Some information about Judo:

General information:

History - http://www.kodokan.org/e_basic/history.html

Overview - http://judoinfo.com/whatis.htm

http://www.usjudo.org/aboutjudo.asp

Judo Contest rules:

For Spectators - http://judoinfo.com/rules1.htm

. . or - http://www.hotkey.net.au/~rodcox/rules.html

Official IJF Rules - http://www.skynet.ie/~judo/main/rules.html

S or -:http://www.ijf.org/corner/qCornerList.php?MenuCode=RJ