Re: Is there a 'Ki Aikido' technique book?
"This is Aikido" by Tohei - out of print
"Aikido and Ki" Kiratoshi Murayama
But Clark is right - the books of techniques will not do justice to Tohei's Aikido. Unfortunately there is not a lot of video on Tohei, but it is worth pursuing. I believe the Aikido Journal has recently posted a short clip.
To me, his Aikido was much more fluid and movement based than others - hence seeing it through a movie, and not just snapshots.