When girls laugh at things you say. Particularly if it's not THAT funny.
http://www.renbow.co.uk/images/blond-girl-laughing.jpg
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I've always thought it was eye contact and leaning toward you.
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when she rolls over and asks what you would like for breakfast... ;-)

(sorry, couldn't resist).

seriously, depends upon your age. at age five, it could be she that she hits you, but only you. as others have stated above, as they get older, it could be a lingering look, a laugh that's a little more than your joke was worth, or making up excuses to be with you--especially when your wife is not around...
;-)
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its in her eyes and her body language , if she is really into you there will be lots of smiling and giggling and touching with her hands, if i fancy a guy i really talk too him, laugh at his jokes and pat my hand on his knee this is the biggest way i flirt with a guy
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Flirting and having romantic interest in you are 2 different things. A woman can be a flirt and she can do that just for fun. If she winks at you or if she's giving you a sly look, then she's just playing with you and you'd better run. :) Basically, you can look for signs like: you have her complete attention, she looks at you with big shiny eyes, she laughs a lot at whatever you say, she touches you, she speaks just to fill the gaps in the conversation. But these are also signs that she is very friendly with you. Whatever she does, you can't tell for sure, unless she kisses you, and that's not going to happen. So the best thing is to screw signs and tell her that you like her in a relaxed manner, so that you don't misunderstand her friendship with her romantic interest.
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There's whole sciences dedicated to this(yes, we men ARE that insecure...). The biggest sign I look for is the touch. Usually she will find a way to touch you(not grope!), on the arm or knee...or in extreme cases the face. Also, if your attentive, look for dialated pupils, it's a natural body reaction of attraction. If she's fair skined, you might also notice a slight flush.

Here's the top 10 from askmen...
http://www.askmen.com/top_10/dating_60/80_dating_list.html
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Everything listed above me so far is excellent, but these are little signs, and I often find that guys are so focused on reading little signs that they miss the big ones. By big ones, I mean signs that a girl is taking conscious action to get closer to you. Watch to see if she's trying to engineer circumstances to spend some time with you, and you alone. Watch during social situations to see if she's taking advantage of opportunities to sit closer to you - especially if she already has a comfortable seat. And COMPLIMENTS - if she's into you, she'll have reasons, and chances are she'll knowingly or unknowingly make verbal remarks about it.

The other big thing that bears mentioning is obvious sexual innuendo. She might just have a dirty sense of humor, but if the comments she makes to you seem specific to you, that's a sign of flirting.
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The BIGGEST sign is that she's touching you. If a woman is putting her hands on you(anywhere) like touching your shoulder or arm or your knee, then you know she is very very comfortable with you. Women don't just touch random people. If they are touching you, then they feel extremely comfortable and are probably very into you.

Not that the other answers on here aren't as true as day, this one is the biggest sign for sure.
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Whoa, that's a tricky one. Mostly tricky coz guys typically aren't very good at picking up on whether girls are flirting with them. Women are much more social creatures and used to subtleties in conversation and body-language that we're often just *bad* at picking up on.

It's probalby going to depend a lot on the situation what you should do. Like, is this person a friend already? Someone you've just met? Or are you after the great first-contact situation where you can be liked or hated or just made no impression at all by the end of it?

Personally, I prefer to get to know people a bit before leaping into the whole dating thing, so I end up with a few opportunities to work out if there be flirting going on. If a girl is really interested she will try to orchestrate opportunities to see you so look out for those signs.

The big teller no matter what the situation is body-language. You might want to read up on that so you can work out the signs people give off, often without being aware of it. If she's laughing at your corny jokes, and playing with your hair as she chats to you, well, that could mean something. Don't take a single sign on it's own though.. she might just be playing with her hair. :) Now, if her eyes only ever look you in the face, she might view you just as a friend ..if you've managed to spot her checking out the rest of you, that's a good sign that some other kind of relationship might be being considered. ;) (But again, on it's own it might mean nothing.. she could just be checking out the rest of you because you've dressed particularly unfashionably. hehe.)

I think reading up on body-language could help you though. That's the one thing people are most often not concious of in these situations, so it's where you can pick up the most information. The rest is all down to conversation and working out the subtleties of that.

The obvious way to work out what she's thinking is to ask to met up with her again (it doesn't have to be a full *date*) ..you'll find out a lot in the reaction to that question. ;) That's, of course, the one thing many guys can't get up the gumption to ask. Getting too hung up on the possibility of rejection does that.
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Biggest? I'm not sure, let me give you all of the signs:
-She sweeps her hand through her hair, as if by compulsion, twice or more in the same 60 second period.
-She seems to find excuses to get closer into your personal space than most people.
-She asks about a weather or not you are in a relationship, without mentioning she has someone to set you up with.
-She offers you food or goodies without offering it to anyone else, or if so, only as an afterthought.
-She brings up a sexual topic, doesn't seem to regularly converse with other guys that way, and you don't know her like that (yet).
-You two have just just had the first mutually fun (if only brief), conversation... The next time she knows she's going to see you, she's unusually dressed up, or has put purfume or more makeup on, when she usually doesn't do that.
-She often touches you (only) in an overly friendly manner, or makes excuses to stop by where ever you are.

...Any two of these occuring with the same woman is likely a flirtatious situation!!!
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If a woman touches your arm or your hand while talking, she's flirting with you.
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Source(s):
http://www.enotalone.com/forum/showthread.php?t=220375

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Usually a smile, moving in closer, squaring shoulders to you, any sort of touching.

When you're talking, she's listening. You're listening too. She jokes around and can relate. If she says something like, "That's interesting because I did something like that too" [maybe not that exactly, but you get the drift.], especially when the connections are far apart, that's when you know she's really into you.
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I agree with the touching. There is no reason for physical contact unless you want physical contact.....
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A woman who flirts with you will try to get you to smile, through jokes, conversations etc. She will try to engage you in physical contact. Some women do it subtly. If you are at work and minding your own business she will try to graze your shoulder, your leg, casually put a hand on your shoulder. Also, you will notice that she will find little excuses to talk to you, perhaps multiple time throughout the day. She will ask you questions or make little comments that are superficial... like your shirt is nice, she likes your new haircut.

Also, watch to see if she repeatedly has you in her line of sight. She could be paying attention to you instead of what she "appears" to be concentrating on. She will also look at you when you are not looking, if you catch her looking she will most likely shift her eyes away quickly trying to hide the fact that she likes you.
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