Ok, I have to drop soem of my experience and wisdom on you. Too bad I missed the thread until now!
First of all, I am (was?) a nerd/geek. Second, I always dated super hot girl: one was a porn actress, a few models and a lot of hot chicks. Looking at pictures of me back then I know it wasnt because of my look: I looked like crap (at least compared to now).
The reason I got all these girls was because I had total confidence in my capacity to entertain these girls. I knew I was someone interesting and funny and that is generaly what girls want. And that is also what you should aim for, a pretty girls who isnt funny is a waste of time.
So the moral of this is not that you should be funny, but that you should have confidence in yourself. Trust me, that is the thing girls crave for. After that, just try to find out what interest the girl and let her talk about it, asking intelligent questions once in a while and that is it!
I have learn a lot from my various experiences and I dont have time to write it all down now, so the only thing you should remember from this is that confidence is the most important thing because it will determine how you present yourself in front of others.
Confidence also means that if it doesnt work with a girl, dont ever start to beg or lower yourself. It would totaly destroy the "confidence" impression the girl had of you and she will lose all her respect for you. You better just say that it is too bad that she isnt interested because you saw something in her, and then move on. The hotter the girl, the more this will thraumatise (sp?) her because she would be used to see guys bend in half for her, and she will either eventualy come back to you or gain a lot of respect toward you. In both case, you win
My friends never understood why my success rate in bars was so high, I always managed to get phone numbers. The trick was to never ask the girl for it! When it was time to leave, I would simply say that I really liked to talk to her and hoped to see her again. Most of the time, she would be the one giving me her number and if not, the next time we met she would be the one coming to see me.
Finaly, all the usual stuff still hold true: smell good, be clean, wear cloths that fit you well (notice that I am not talking about being a fashion victim), respect the girl, be funny, interesting and able to articulate your ideas.
Hope some of these hints help you! It surely helped me to get my lovely wife!
