Raised eyebrows: If you girl looks at you and institivly raises her eyebrows, not a big movment, just a slight instictive movement, she likes you.
Showing the back of her wrists: If a female shows you the back of her wrists (Subconsciously) she is showing she is submissive of you and wants to be dominated by you. The back of her wrists are a vunerable spot. I know femanists will hate this but it's true, it's a behavior left over from cave man days.
Feet: If your standing and talking glance at the feet. If there facing you it means she is into the conversation, if they face elsewhere it means she wants to be elsewhere. This is just a sign that she likes talking to you, but it's a foot in the door, some of the best relationships are when friends get together.
Pushing out her breats: This is when a female pushes out her breats to try and get you to see her assests. Not sure if this one works well, especially with smaller breasts.
Playing with her hair: If she does this subconsciously while talking to you it means she is trying to make herself look better for you. Of course so many females know this one that they often do it just to annoy blokes.
Smiling at you: Duh, if she smiles at you she likes you, as a friend or as something more.