Yoshinkan Aikido:

Shioda Sensei (Founder): http://www.youtube.com/watch?v=JIowy89IXco

Chida Sensei (8th Dan): http://www.youtube.com/watch?v=aicHsMC6rxM

Takeno Sensei (8th Dan): http://www.youtube.com/watch?v=l6Y3WZuUtVo

Muguruza Sensei (6th Dan then, now 7th) -- includes basic techniques: http://www.youtube.com/watch?v=ZixZZjgvv5U

Yates Sensei (6th Dan then, now 7th): http://www.youtube.com/watch?v=aicHsMC6rxM

The Senshusei Course: http://www.youtube.com/watch?v=AIt_g0amnis