Bujinkan Hombu & Ayase Classes
Kutaki no Mura - Forum
Doug Wilson's Blog
Goshin Arts
Shugyo

Dojo:

Arkansas Bujinkan Dojo
Australian Bujinkan Dojos
bujinkan-kouryuu.com
Bujinkan San Francisco Dojo
Bujinkan Tohoku Dojo
Cleveland Bujinkan Dojo
Dayton Bujinkan
Ichi Nen Dojo
Jigoku Dojo
Koteki Dojo
livingvalues.com
Meden Bujinkan Dojo
Mizu Nagare Bujinkan Dojo
Muzosa Bujinkan Dojo
Ryu Bujinkan Dojo
Saint Louis Bujinkan
Shadow & Light Academy
Wan Yun Loong Combat Lab

Forums and info:

Bujinmag.com
Ninja Club
ninjutsu.com
winjutsu.com

Supplies:

Budovideos.com
Bugei Trading Company
Bu Jin® Design
Swords, Knives, Collectibles - CASIberia.com
Mantis Swords
Tomu Martial Arts Supplies
Gido.no Martial Arts Supplies