This is a great book on LinkedIn. It's an easy read and helped me get up and running quickly. The tips showed me how to create a profile that will (hopefully!) attract the attention of recruiters. I also picked up some good ideas on how to post a real resume, display some samples of my work, and showcase my expertise that I wasn't aware I could do on LinkedIn.
One of the things I really liked about this book was that it avoided the social networking hype of some other books I've seen. It's a good choice for professionals who are looking for a realistic way to use LinkedIn for their job search or their business. I liked the free online version that comes with the book, too.