I stumbled across "101" while completing a graduate project and found it by far one of the better books introducing the "divide" between premodern, modern, and postmodern. While I have read many (20+) others, I found White even handed - he is not an alarmist (which it seems so many are), nor is he dismissive ("It's only a fad...it will quickly pass"). My suggestion? I would couple "101" with "Who's afraid of postmodernism?"
I read this book with fascination as person straddling the fence between modernism/postmodernism and not even knowing it. This book is a highly readable primer on exactly WHAT postmodernism is and should be considered a prerequisite for anyone considering jumping on the Ravi Zaccharias or Chuck Colson save the world bandwagon. It is so easy to condemn PM without knowing of what we speak when truly it is an (extreme) reaction to our (modernism's) failures. With a good understanding of what we are faced with, where it came from, and why we are faced with it, along with a great understanding of why we moderns believe what we believe we will be far better prepared to lovingly correct the errors of postmodernism and come alongside those who have embraced inevitable changes in the world and still work to bring people to a saving knowledge of Christ.P.S. I am a great fan of both Zaccharias and Colson.