There are a vast number of video on Youtube and the internet dealing with Aikido, here is a selection from mostly Australian Sensei and Shihans, or of Sensei who have a special connection with Aikikai Australia.
Sugano Shihan (Seiichi Sugano)2010
Sugano Shihan explains the Japanese Sword
Sugano Shihan demonstrating boken kata
Sugano shihan à Paris, 2007
Summer School 2011 - Memorial
Yamada Yoshimitsu Shihan
Mike Abrams Shihan
Tony Smibert Shihan
Robert Botterill Shihan
Hanan Janiv Shihan
Phillip Lee Sensei
Roger Savage Shihan
Carel Zappeij Sensei
Louis Van Thieghem Sensei
David Scott Sensei
David Brown Shihan
John Rockstrom Sensei
Felicia Birman Sensei
There are two type of ki: ordinary ki and true ki. Ordinary ki is coarse and heavy; true ki is light and versatile. In order to perform well, you have to liberate yourself from ordinary ki and permeate your organs with true ki. That is the basis of powerful technique. 
