That well explain book use to be extension for wikipatterns website. If you get to point where your current wiki structure could need some structural refactoring that reading that book u sreally good first step to do. Personally I've realize how enterprises wikis could affect workflow in company or any other organization. It's not about installing or administration any specific wiki. It's purely about the way to use wiki depends on your organization needs. Important note is enterprise wikis are usually commercial. Where some patterns will works fine with mediawiki and other opensource ones, you may find implementing some of them harder than it's sound on free software.
I enjoy it as easy reading position. If you are professional on knowledge management probably you won't probably find extremely new things here, but book is still not boring or trivial on explaining patterns and antipatterns.
I was interested in the structure of wikis and how people use them. This book however does precious little in explaining either. Rather it constantly refers to the website with the same name. Wikipatterns features several interviews that are very much alike with the same obvious answeres to questions about how companies implement wikis. My advice to anyone thinking about getting this book, don't. Instead go to the website.