From Amazon.com ~ Hailed as the “MySpace” for professionals, LinkedIn has taken the Internet by storm. It is now estimated that 19 million business professionals log in to this site every day to look for job opportunities, search for potential clients, get recommendations from colleagues and reconnect with former coworkers. LinkedIn allows users to create a profile detailing their professional experience and accomplishments, which will help them connect with literally thousands of qualified professionals in their field. How to Succeed in Business Using LinkedIn takes users through every aspect of the site, from getting registered and building their network to posing questions and creating groups.
I've been on LinkedIn for a few years but didn't appreciate it 'til I read Jason Alba's I'm on LinkedIn -- Now What??? last year.
Eric and Kathy's book takes you step-by-step through everything and includes screenshots.
If you want to learn more about LinkedIn and all it can do, this is a good book to check out.