Often I will tell my athletes to read something on their off days. Not being perfect I make a reading suggestion because the author explains it better or different than I. Aikido Journal has a blog called "Schism and Disharmony -- The Bumpy Road to Aiki," by Alister Gillies http://blog.aikidojournal.com/2012/0...es/#more-20649
My only criticism is it is a blog is a blog. It is too short not able to give more details. If I was going to define aiki in the framework of Aikido this would be it.