I've been on LinkedIn for a few years now and never really got the point. I guess I viewed it as a large dynamic phonebook to track co-workers when they moved on to new jobs. And I realize it is useful for recruiters as well as anyone wishing to start a company, but I'm neither of those.
My view of LinkedIn was changed earlier this week when I actually got a prospective customer call based on their LinkedIn search. I met with them today and if all goes well it will be my truly useful use for the site.