ZPavelZ: I heard today on the news that while for some people/countries leap year and leap day are supposed to be a bad superstition for others it is a reason for celebration, indeed. For instance, in the old days this was the only day when girls in Scotland could propose marriage to guys (as opposed to the other "normal-for-that-time" way around). I do not know whether this is true or not, but if someone celebrates this day - enjoy! :)
The locals I've spoken with today didn't know what a leap year was, and in trying to explain it to them, it became clear that they also didn't know about simple concepts like orbiting. They did know that the earth moves in circles, but they didn't really get how it works.
edit: In fairness, I should note that I'm currently in the countryside for a couple of days, and the people I'm talking about were uneducated even by Cambodian standards. I'd imagine people in Phnom Penh are probably more clued up.