I have many, but one of the best reads I enjoyed was a book by Marty Bell.
"Broadway Stories - A Backstage journey through Musical Theater"
He interviewed many theater personalities around the 1992-1993 timeframe, and they shared their experiences on shows they were working on.
Examples:
Faith Prince discusses Guys and Dolls
David Zippel discusses how City of Angels came about
Kay McClelland talks about Nick and Nora and her role in the show and the craziness around it
Susan Stroman talks about Crazy for You
Karen Ziemba talks about "And the World Goes Round" and "Most Happy Fella"
Stephen Borgadus discusses Falsettos and his involvement with the show for 12 years
and a LOT more...
These are not short paragrahs either, like "Making it on Broadway" is made up of. These are chapter length discussions and they are incredibly detailed and very honest. I am always surprised no one else mentions this book in these threads!
I don't know if it's still in print or not, but if you can find it...GET IT.
"My dreams, watching me said, one to the other...this life has let us down."