http://www.shinto-muso-ryu.org/ - The site of Relnick Sensei, the leader of the Pan-American Jo Federation.
http://en.wikipedia.org/wiki/Jodo - Wikipedia article on Shinto-Muso ryu.
http://koryu.com/guide/muso.html - Koryu.com guide to Shinto Muso-ryu
http://www.shutokukan.org/apply.html - Shutokukan's membership application page. The Shutokukan is an affiliated dojo. Specific information on this page (such as fees) may not apply to Baltimore Jo, but the general information about the style and practice do. There are also many good links with information about Shinto Muso-ryu and koryu in general.
http://www.ecoledubudo.com/krieger/index.htm - La Voie du Baton, or The Way of the Stick by Pascal Krieger Sensei, written in both French and English. A well done book on Jodo, and on Budo in general for that matter.
http://www.marylandjodo.com - An affiliated group based in Frederick, Maryland.
http://www.shutokukan.org/ - The Shutokukan, an affiliated dojo in New Jersey.
http://www.fej.ch/en/news.htm - European Jodo Federation
http://www.jodojo.com/ - The website of Nishioka Tsuneo Sensei, the oldest living teacher of Jodo.
http://www.baltimoreaikido.com