I just finished reading Trust Agents by Chris Brogan and Julien Smith, a book on how social media is becoming embedded in personal and career progress (okay, that's probably a poor shorthand, but that was the crux for me).  It was very interesting and I thought it was insightful.  These two authors spend a lot of time using and managing social media - more than many people have the time to spend, but their thoughtfulness about how to really keep a personal / professional network vibrant and meaningful is helpful even to those who are not tweeters or bloggers.  I also liked their view of "creating your own game" - this is a concept that goes far outside of the technology and social media - but it helpful for anyone evaluating their own career.