What kind of networker are you? There are many types of networkers and the goal to networking is to develop relationships that are mutually beneficial with people who can offer you advice and help both personally and professionally. The main thing to remember is that you have to give to get. Most people are happy to share their ideas and expertise with the hope of helping you achieve a goal, and these same people find it refreshing when you ask them how you can help them.
You don't want to be the networker who goes out just to collect business cards or focus only on what you want to get out of the meeting. The world is a much smaller place than you know and word gets out quickly when someone is only out to pursue their own interests. I think it's important to get to know someone's character and business practices before you make an introduction on their behalf.
Are you the type of networker that only focuses on people from a certain profession or experience level? My experience is that everyone has something to offer. Since being in transition, I have met people in many different industries with various amounts of experience, and I have learned some valuable information from each person I met.