Not convinced? Read up

The media coverage has been very good of the site. Although media tends to dress up any new technology, the millions of active users should help drive home their point: it works very well.

I recommend: See the major media coverage at LinkedIn's media coverage page. Mike Copeland's genesis piece about the initial investors in Business 2.0 is especially good, as well as Sree Sreenivasan's basic guide to using LinkedIn.

Register and set up your profile

This is not rocket science, yet most new users fail to complete the profile, probably because it feels like creating a resume for a job site, and many who flocked to big job sites a few years ago likely came away unimpressed.

I recommend: Ignore that feeling. Register first at LinkedIn.com and don't skip anything. Creating a complete online profile, which is essentially a form of resume, is key to enjoying all the possible connections. Put in your current job, all past jobs by date, all schools, any clubs, etc. Why? Because then LinkedIn can show you every possible person on the network that you might know from each place or time. Weirder still: People you know from one place may know others from a second place in the past. Suddenly, those connections are made visible.

Automate your contacts process

You can download your contacts from Outlook or web-based mail like Gmail or Yahoo! and then upload the CSV file, or just tack on a toolbar to add folks on the fly.

I recommend: The toolbars work with Outlook, Microsoft Explorer and the Firefox browser. Because the effectiveness of the site for you personally will depend on how many contacts you provide, don't be stingy. Upload anyone and everyone you do business with, and invite them. Once you get registered, it will even scour your web-based mail automatically.

Kick it up a notch

LinkedIn's business model is equal parts dot-com and web 2.0. That is, they expect lots of ordinary folks to join and pay nothing, but they also expect some -- particularly salespeople and recruiters -- to pay for higher levels of access.

I recommend: Among the premium offerings are direct links to users and something called InMail, which allows you to e-mail them directly whether you are connected to them or not.

Strength in numbers

There's a lot of people in LinkedIn, so it can be comforting to make connections quickly through a group.

I recommend: Check LinkedIn's group directory for your alma mater, employer, former employer, networking assocation or other professional group. Don't see yours? Then start one!

Find a job -- or a candidate -- on LinkedIn

Job hunting is probably the most absorbing feature of the network. Jobs listed directly from your network appear first, and then from the wide-open web, but with hints alongside of who you might know at the hiring company. Powerful stuff.

I recommend: Read up on job searching or job filling at the LinkedIn help site. If that's not enough, it's far more concrete to join and try the controls from within your profile.