• Have confidence in yourself. If you like who you are, we'll like who you are.
• Be independent. We want to take care of you but we want to do it because we care for you, not because you are overly dependent and needy.
• Dress well but wear whatever you have with your own style. We like the skirts that show plenty of stockinged-leg and skin will catch our eye, but you're much more fun when you're comfortable.
• Don't worry that you don't look like a model. Believe it or not, we don't fall for the pretentious image that the magazines and movies suggest to us. We'll like the way you look because of your mischevious grin or your warm eyes or maybe the cute way that your nose sort of looks like funny button from the very front.
• Don't play dumb. It isn't cute and it's more insulting than endearing.
• Don't drink too much when we're getting to know you. Your inhibitions may be lowered and you might say or do things you would not normally do.
• Again, while you're getting to know us try to be relaxed. If you're comfortable, we will be too. You're probably not the only one who's nervous.
• Thank us when we do something for you. It really does mean a lot that you don't take things we do for granted.
• Ask about our work or our hobbies and interests. Listen to us when we talk with you about them. It wouldn't hurt to ask questions, either. Work is a big part of our lives and it feels good to know that maybe what we work so hard at is of at least a little interest to you. Sure, it's just an ego thing -- but it goes a long way.
• Compliment us on what we're wearing. We put a lot of effort into looking good as well, but we're very rarely ever noticed for our efforts.
• If you can stand your own in an intriguing conversation about something we're intersted in, you'll have us hooked. We like to share things we enjoy with you (and yes, you deserve the same interest from us in the things you enjoy). If the man you're trying to impress is really into computers and you can put up a strong discussion on electronic privacy or hardware or even just cool video games, you'll have us eating out of your hand. Or if we're into philosophy and you share an interest -- even if it's just in reading philosophically-leaning writings, we'll find you not only more intriguing, but our respect and admiration will grow by great bounds.

If you're out-going, act out-going.
If you're the shy/quite/innocent type. Be that way.
Forget what you know about guys. Not all of them like beer and rugby. And also, not all of them like Perl and Star Wars.

This can be applied to how to impress a woman as well.

For more specific woman things (IMHO):

• Don't wear too much make-up. I want to see you beautiful face. Not the make-up.
• Guys do like to see skin... but not too much. Show off a bit, but leave some for the bedroom.
• Wear nice clothes (and underwear/lingerie).
• If you have long hair, play with it a bit.
• Smile. Make cute giggles (but refer to my first point, don't be fake).