Headhunters get a lot of resumes sent to them from people looking for jobs. They throw most of them away. So it's only worth mailing resumes if you mail them to recruiters who really place people like you. That's the strength of this directory, because it has loads of indexes where you can find headhunters in the right industry, right state or near where you live. It also names individual recruiters and what they specialize in. The odds are still long, but at least you can get in front of relevant people. And that's the real value of this book. Interesting footnote: many headhunters use it themselves, suggesting that it's probably the reference of choice among the pros. The advice section at the front is pretty good too.