on amazon you will find really good imagineering books. Walt Disney Imagineering: A Behind the Dreams Look at Making the Magic Real book is really fantastic, in november comes the sequel to this book, a behind the dreams look at making more magic real.
also the disney mountains: imagineering at its peak is a great book too, john hench: desining disney and the disney imaginnering legends are good books too.
i donīt know how these books are, The Imagineering Field Guide series about the parks in disney world.
you will find all of them at amazon, just search for disney imagineering....