I don't kiss anyone on the lips except my DH. Everyone else is either a hug or a kiss on the cheek, depending on the situation. A kiss on the cheek is quite normal as a greeting over here. elder family still goes for the three kisses, but that's getting out-dated. Formal family meets is two kisses. Congratulations is still three (birthday, new year, etc). Friends, colleagues, younger family goes for one.
My mom however, always tries to kiss us on the lips, and it drives me crazy. My sister and brother too. It's always a battle of trying to turn your cheek at just the right time, because she tries and tries again and actually moves to try and catch you anyway. Ugh!
I'm actually trying to think of a way to get her to stop permanently. With little baby-syrse in the family now, I really don't want her to extend the habit to her as well.