LinkedIn

LinkedIn is a great networking website all professionals working or not should join.  You can connect with past and present colleagues and friends.  Here you make a profile of your professional career and network through your contacts.  Search through your contacts to see if any of them have contacts you may or may not know in your fields or even at certain companies.  This can be a great way to find the correct hiring managers or other recruiters of interest.  Recommendations can also be written about members.  You can find jobs and groups here as well.  It is free to join and a great networking resource.  They do offer a premium upgrade for $29.95 per month but the free resources are not to be passed up.