Sensei Ed Martin and the Pennsylvania Dojo Website. Full of information, books, videos and training aids. An excellent resource for information on everything Bujinkan.
For information on training in Japan, messages from Sensei, maps and links
George Ohashi - Japan Hombu Information
THE definitive Bujinkan site from the Source Himself
Bujinkan Dojo - Soke Masaaki Hatsumi
Fantastic information on the "dual-life values" of Robert L Humphreys, Bujinkan, Kids - in fact everything you need to know and probably a bit more!
Warrior Information Network - Jack Hoban
Gillian Booth and Frances Haynes's Dojo in Sydney
Courageous Heart Dojo
Duncan Mitchell's dojo in Queensland
Bujinkan Dojo Brisbane - Duncan Mitchell
Peter White's complete "who's who" of teachers and dojos in Australia
The Australian Komichi Dojo List
Great site - stacks of stories and histories on Takamatsu and Hatsumi Sensei and detailed histories of the 9 Ryuha
Missouri Bujinkan Dojo
The original and the best - Mats Hjelm's sprawling website on absolutely everything Bujinkan!
Kabuto's Bujinkan Website - Mats Hjelm
Discussion board for Bujinkan practitioners worldwide. Owned by Shawn Gray. Well moderated and lively discussions. Enjoy!