I'd like to shamelessly plug my Instuctor's book entitled:
"AIKIDO and RANDORI, reconciliation of two opposing forces."
I thought this book might be of interest to many people here as it shows the Shodokan Aikido system and principals, and discusses randori (shiai) - the first non-japanese book to do so in any depth.
You can find the book at;
and details at;
Hope this is of interest,