Obviously, the first thing one must do with any kind of social site of this nature is to make sure the size of their LinkedIn "karma" is sufficiently large. So I've been looking around for everybody I know so I can ask them to be my LinkedIn Pal®. But the search mechanism doesn't show you names of persons. This made no sense to me until I saw that they wanted you to pony up some cash to see persons' names. Then it made sense.
So anyways, if I know you and you've already gone to the pains of creating a LinkedIn profile... connect!
I am very suspect of any utility of these services. I have no idea what I would use it for or what others would use it for, but I'll give it a try and see if I can glean anything from it.