Here are a couple fun posts that highlight the value of taking the initiative to relate well with others. This will come more naturally for you extroverts, but even we introverts can learn to proactively establish, build, and maintain relationships with others.
Tom Peters on the value of MBWAing – a topic I have discussed many times on this blog. Are you reading this at work? If so, get up and circulate instead.
And Seth Godin links to a rather amusing story of a guy who wears name tags all the time and has opened up a world of approachability.