LinkedIn is a great business networking website for those who are regular users of the website. It is very useful for businesses and employers looking for that next hire. Its interface is very clean and simple. It also helps to find your old colleagues, classmates and friends if they have LinkedIn accounts.
It offers four sections like 'LinkedIn', 'Connections', 'Search', 'Status'.
'LinkedIn' shows the latest connections between all your contacts. 'Connections'sShows you your entire list of contacts. 'Status' displays built-in update capability for the LinkedIn site. 'Search' provides you the contact you are looking out for. If the profile is on LinkedIn, then even if it is not in your contact list, you will find it.
This makes it perfect for making, maintaining and finding business contacts.

I myself has got my account and could find many of my classmates with whom I had lost contact.

I am pretty satisfied with the site and recommend this to others with 5 star rating.

Well, I just recently started on LinkedIn, and so I'm reviewing from a newbie perspective.  It seems very easy to get started, and get connected with other like-minded business individuals.  I use it to network with other work at home moms. I haven't been blown away by the site, though.  It seems confusing, but that may be becase I'm still new.  I do like how it keeps you updated with all of those in your network.  It's reminiscent on FaceBook in that way.   The ads are not obtrusive, they are nicely interfaced into the site, so you see them, but they don't become annoying.  Overall, it looks promising, definitely worth checking out.

I actually set up my LinkedIn account because a friend on Facebook asked me too.  She wanted to be able to have access to my reference info at a click.  Its a really neat site.  Its very user friendly and very easy to set up an account.  People you know can search for you via your name, so its really easy to find people you work with and add them to your network.  It doesn't have all the dings and whistles that the social networking sites have, as its geared more toward job networking, but you can also keep in touch with friends via this site if you want.  I would recommend it for everyone, as it is being talked about more and more at work and I think its the next big thing.