What are some body language IOIs to look for? Say when you are talking with a girl, just sitting next to one in class, or sitting on a bench in the hall while they walk by. Some I've heard or read about are...

1. Quick eye contact then looks down. (really indicates shyness but could be an IOI)
2. Playing with hair. (Is this for real? What if they just have an odd obsession with their hair?)
3. Imitating body posture.

I have a question about the last one... Its kind of weird. I sit next to this HB8 in one of my classes. I've never spoken to her before, but I think she is interested. Anyways, during class, I take note of how she reacts to when I change posture. It seems once she notices a shift in my posture (say from hunched forward to leaning back with my feet up under the seat in front of me), she also changes position after about a minute to whatever position I am in. I noticed it all class, and it started to freak me out. Is this really something that would be considered an IOI?

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You have to put the body language in context. So if a girl randomly plays with her hair without you even talking to her, you really cannot conclude that she feels attraction.

Some of the big BL IOIs are:
-playing with her (especially when you are DHV-ing)
-licking her lips
-exposing her neck by moving her hair on one side and tilting her neck
-mirror body language (is more when the girl feels comfort/rapport with you)
-legs crossed not against you, when you sit next to her. So if you sit left of her, her right leg is over her left leg. Generally says that she feels comfort/rapport with you.

This one is sometimes tough to see, but if the pupil (black area in the eye) dilates (grows bigger) then she feels attraction.

Others that are more 'subtle' are when the girl keeps touching a particular accessorie, like her watch, ring, earring etc.