The book was A Citizen Legislature, (a proposal based on an earlier article I wrote for the Co-Evolution Quarterly) on the creation of a random legislature. The book is still free online. I hope to talk the co-author, Chick Callenbach, into putting it online for a low price.
Reminder, the idea is slowly coming to life. Next years California legislative districts will be apportioned by a randomly selected committee of 15 ordinary citizens.