Here's what I know...
1. Polite is polite- you don't have to be over the top like standing up every time she goes to the bathroom, but basic politeness goes a long way.
2. Girls notice if you open her car door for her or just head straight to the driver's side.
3. Girls notice if you allow her to go through the door to a restaurant first or if you plow through.
4. Girls notice if you buy a drink for her friend as well as her when you are trying to impress her.
5. Girls notice if you offer to go with her to help her get her towed car instead of just saying good luck.
6. There are men out there who are still very chivalrous- girls notice them, remember them and like them. Why not be one of those guys?