Here are some useful links from around the web for Judo:
Wikipedia Page: http://en.wikipedia.org/wiki/Judo
British Judo Association: http://www.britishjudo.org.uk/home/index.php
London 2012 Olympics Judo Schedule: http://www.london2012.com/judo/index.html
Judo Information Site: http://judoinfo.com/new/
Transcript of Talk Given By Judo Founder Jigoro Kano: http://judoinfo.com/kano2.htm
Kokakids - An excellent resource showing Judo techniques: http://www.kokakids.co.uk/techniques
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