Top networking organizations for IT professionals

We've all heard the expression, "It's not what you know but who you know." The older I get, the more I realize how true that is.

Monster.com ran a piece recently that emphasized the importance of developing networks of people in your field, "even in the crazed world of database administrators and PHP programmers." One way to develop a network is to join an IT organization so you can develop professional relationships with others in your field.

Here is their list: