I'm sorry I did not have this book sooner, as it would have saved me a lot of research time. The section comparing the major wiki brands and describing what is best for an enterprise wiki was very useful.
About 60% of the book covers Confluence in depth and in many aspects, including planning, installation, third party add-ons.
There is excellent information on best practices around managing and using a wiki - any wiki. There is a lot of useful information on managing wiki content like... community contributed content, managing spam, crowd sourcing (the good and the bad), content reuse, and single source publication (the book was written on a wiki).
The author clearly has had many years of experience in all these issues, so it's very good to be able to access all this knowledge in one easy to read book.