I've been part of LinkedIn for a couple of years now, but never found it particularly useful until recently. The site has gotten better and better and I've used it quite a bit in the last few months. I'm building out my network a bit more, so if you are a regular reader, please feel free to connect to me. You can sign up for free.
UPDATE: If you need to contact me directly, it's rob@(insert-this-domain-name-here).com