Aikikai Foundation - http://www.aikikai.or.jp/eng/index.htm
British Aikido Board - http://www.bab.org.uk/
British Aikido Federation - http://www.bafonline.org.uk/
The Aikido FAQ - http://www.aikidofaq.com/

Shobu Membership Form (xls)
Instructors' PI Form (xls)

The Foundations of Aikido (doc)