I don't want to hijack the thread away from 20, but I figure this applies to me as well (and 20 hasn't said anything in several days.)
I met a girl, went on a date with her (although her friend came along too, so does that count as a date?) I called her, asked her if she wants to go out again, she said she's "up for it." It's obvious she doesn't mind my company, the question is, how can I tell if she's into me? We both have alot in common, and I feel like this could go somewhere eventually.