Survey your territory!
It is important that you stay aware of what is going on around you, look alert and focus outward. Keep your attention outside yourself, towards a particular flirting target (!) or towards the general social environment. You can't flirt while you're self-absorbed.

SOS for love
Signal interest. If you have already identified your target, communicate through your attitude that you are genuinely glad to see him or her. If you aren't acquainted, use a lingering glance or slight smile. Don't be too obvious; you must maintain the thrill of the chase!

Walk tall!
Straighten up. Good posture, with shoulders relaxed, triggers subconscious arousal responses in both you and your intended target.

The Secret senses
Touch. If you are a woman, touch your flirting target on the arm, hand or shoulder. If you are a man, touch your flirting target on the back or shoulders when you help her on with her coat, or when you hold out a chair or open the door.

Eye Spy
Use your eyes. Whether in conversation or across the room, look at your target's eyes a little longer than necessary, and keep a small smile on your own face while you do that. But winking is a no no.

Speak Easy
Pay a compliment. To flirtatiously compliment a man, mention something he does well. To flirtatiously compliment a woman, mention something about her knowledge, understanding, expressiveness, or appearance. Start with one compliment per flirting session.

Body Talk Use body language. Face your target, keep your arms uncrossed, and lean forward slightly.

Light Wing
Lighten up. Keep your seductiveness subtle. Sexy is not the same as flirtatious, and an overly seductive manner or dress kills flirting.

Bust a move
Learn to dance. At least, move to music in private. All great flirts have music in their being. (You got to check out this crazy site for the latest moves!)

Lip Service
Smile when you don't know what to say, and smile to show you're impressed with your target. It's still the most potent flirting tool.

Good luck, and come back and tell us how you scored!