Wordwind: I was taught to say "It was nice to meet you" upon first being introduced to someone, but afterward, upon meeting up with that person again, to say "Nice seeing you." I suppose this is because we "meet" or are introduced to someone once (usually, barring Alzheimer's in the introducer), so it makes more sense to thereafter say "see" instead of "meet".

Did that make sense? It's very early in the morning, and I'm not sure of much before the second coffee.