How do you judge whether a "How-to" book is worthwhile? With business books, I ask one simple question: After reading the book, did I bring away at least one thing that made a positive, measureable difference in my life? If so, it was worth the time and money spent on it. "How to Work a Room" is just such a book. I picked this book up while waiting for someone, opened it to a random page, and read the short section on meeting people at parties by "acting like a host instead of a guest". A week later I went to a meeting of an organization I wanted to join, and found that I arrived at the same time as the woman in charge. Remembering what I had read, I immediately pitched in (before even introducing myself, and ignoring her pro forma protests) to help her get set up. Along the way, we introduced ourselves, and as the other officers drifted in, I was introduced to them (with the president's obvious stamp of approval), and so on until not only was I known to everybody there, but I was in the thick of things as a comfortable part of the inner circle. Now, maybe everybody else in the world already knows this stuff, but this kinda shy 40-something man didn't. I made more friends and business contacts in 3 hours than I had in the entire month before. Bottom line: I haven't even read more than a few pages yet and I've already got my positive, measureable difference! Buy it, read it, use it.