I'm reading "The Girl's Guide to Kicking Your Career into Gear," and the authors make the following statement about how not to network:
Don't tell someone you're networking even if you are. Networking should be a somewhat organic exchange between two people who like each other or at least have a lot in common professionally. If you don't click personally, it just won't go anywhere. It's like dating--you know there's the possibility of sex, but you don't talk about it.
Don't start out asking someone what they do. That should never be the only thing that defines you, and if someone is focused only on your career, it leaves you feeling pretty cold.
Introduce yourself when you meet someone new, not five minutes into a conversation.
I think my buddy at W3C2 could benefit from the last one.