Don't be afraid of rejection when you make that first move. At some stage you have to take a risk to make the relationship happen.
Make eye contact and be yourself. You can't keep up a false persona for ever.
Smile! Just an approachable, happy to meet you version, though, rather than an over-bright and plastic smile.
We all want to find someone with a sense of humor. Don't confuse this with cracking jokes: try some banter or a bit of gentle teasing.
Listen. Don't be thinking about the next chat-up line - respond to their love of travel/thimbles/ancient history with a spontaneous question.
Don't sit with other women the entire night and constantly talk to each other. Men don't want to be rejected in front of a group, so separate out.
Try to remember everything about the other person. That way if you see them again later on they'll be impressed by your memory recall and feel special
Mimicking the body language of the person your talking too subconsciously makes them more receptive too you.
Learn to receive compliment graciously. When someone says something positive about you, don't deny or refute it. Instead, thank them.
Look over your shoulder and smile at him. This clearly communicates interest. Later move to a position nearby him so he can easily approach.