Since it´s a question about organizations: Are you asking about Takemusu Aikido Association (http://www.takemusu.org
) or Takemusu Aikido Kyokai (http://www.takemusuaikidokyokai.org)?
Those are the only ones I can think, but since Takemusu is a "generic" term in aikido that is used in different linage's from the founder I´m sure that could exist several other associations with the name takemusu in it...
Edit: Since you are in Australia, I guess you are asking about Takemusu Aiki Association of Australia (http://aikidoaus.com.au/index1.htm)?
One of the listed instructors (Jason Wotherspoon) is a very actice member on Aikidojournal webforum (http://www.aikidojournal.com/forums