"Web 2.0 and Social Networking for the Enterprise" is an overview of IBM products for the social networking. (See my review of "The Social Factor" for a better, less IBM specific take on the world while still being written by IBMers.) I also had a "this book is in search of an audience" moment at the beginning. It assumes you haven't heard of AJAX and then goes on to show long detailed code.
As far as product overview, I think the book does well. It covers different IBM offerings (portlets, connections, quickr, etc.) There are many screenshots and the book talks about what each one is good for. There are some tips throughout, but I felt they got buried in the "how to use the tools" descriptions.
If you are working an a shop using IBM social networking products, this is a good guide to them all. My low rating is because I didn't get that's what it would be about from the title or subtitle. I expected it to cover more "guidelines and examples for implementation and management within your organization." I feel "The Social Factor" does that in a less product centric way.
Disclosure: I received a copy of this book from the publisher in exchange for writing this review on behalf of JavaRanch.