Eye Contact and a Smile

Really, this one can go for men or women - simply, smile at that person when you see them, and when they're talking keep eye contact with them (or at least on their face).

Smile when greeting them, smile when saying good-bye; keep eye contact and make it seem like whatever they're saying to you is of the utmost importance - which it should be if you're trying to woo him/her!

This really does work, just let it come naturally. It was simple things like this that my boyfriend and I did to catch the other one's attention, and we're now bordering on 6 months dating.