I can summarize this book in a few words: learn from the past. Gleick gives a great and detailed explanation on how different things were invented and the process behind. With this, computer scientist and engineers are able to perfect or enhance the current technology.
Gleick does have an optimistic view of what is to come because he believes that there will be an unlimited amount of information with just a click away. As time goes on, will there be an overload of information?