I've just read this book ( http://www.ferrazzigreenlight.com/nevereatalone/index.html ) from Keith Ferrazzi: I've found it VERY interesting.
From the jacket: The secret, master networker Keith Ferrazzi claims, is in reaching out to other people. As Ferrazzi discovered early in life, what distinguishes highly successful people from everyone else is the way they use the power of relationships—so that everyone wins. In Never Eat Alone, Ferrazzi lays out the specific steps—and inner mindset—he uses to reach out to connect with the thousands of colleagues, friends, and associates on his Rolodex, people he has helped and who have helped him.
I've got MANY good tips and tricks AND reinforced a mind set toward building a decent network.
Living in Italy I see that NOT everything is ok for our life style AND some parts are a bit too 'high level'.
To tell the truth I must say that I have to oblidge myself to 'use' to this network idea: I see the value, I'm usually fine in linking with people BUT I fee like 'using' people for my pourpose.