Videos of basic movements from Kendo Jidai magazine with Koda-sensei
Kendo Promotion Exam Study Guide from the AUSKF
Pages about the concepts and history of kendo from the AJKF
The Ideology of the Sword, by Prof. Toshinobu Sakai, University of Tsukuba (a longer read)
Rensselaer Polytechnic Institute Kendo Club lists a lot of good resources and guides for kendo students.
Regulations of Kendo Shiai (Competitions) and Shinpan (Refereeing) released by the International Kendo Federation