I have been a member of LinkedIn.com for a few years. I have created a hub of people involved with Sun:- employees, ex-employees, Sun Partners and users of Sun gear. With over 12,000 people directly connected to me, I am the 18th most-connected of the 9+ million members!
My philosophy for this type of network is to first help people; them, in the future, when I need help, it will be given.
See my profile at linkedin. Read about Linkedin.com
I noticed recently that www.linkedin.com is displaying a "powered by Sun" footer graphic.