Women display similar preening characteristics to men but also have additional signals which generally indicate an interest in the person they're talking to.
The Head Toss
This is done to throw her hair over her shoulder. This attracts attention and shows off her neck. The head toss is also used by women with short hair too.
Exposed wrists
If a woman is interested she will expose the smooth, soft skin on the inside of her wrists.
She will also show the palms of her hand whilst talking.
Sideways glance
The woman, looking out from partially dropped eyelids, will hold the man's glance for a fraction of a second but just long enough for him to notice. This definitely indicates an interest.
Legs
It's all in the legs - Women use 3 positions to indicate their interest:
The pointing knee
When sitting down one knee is bent to allow the foot to be tucked under the opposite thigh. The knee point will be aimed at the person the woman is interested in. It is a relaxed, informal position.
The shoe fondle
If a woman crosses her legs and lets her shoe on the top leg hang off her foot pay attention - if she starts playing with the shoe, allowing it to slip on and off her foot then you're being given a clear message of interest.
The leg twine
Apparently many men consider this the most appealing sitting position for women. With one leg pressed against the other it appears to be extremely toned.