Have been using Linked In for the past year. I'm finding it to be a very good networking site. With plenty of groups to join you can get some very good information on subjects that interest you and contribute to give people a real insight into you and your services.
I personally do not use it to find business, but rather to make business contacts who could become useful in the future.
My public profile: http://de.linkedin.com/in/stevenssean
