My son used to do this and it bothered me. Maybe he still does but, as an adult, he just makes sure I don't know. There is something about it that strikes me as too casual. Perhaps I'm just a bit of a dualist and this integrates mind and body too much. I'd be willing to say it's because I am older but my wife says she used to do it when she was young. At the time, she was way cooler than me so I have nothing to say.
But please. It may well be that Sarah Palin is not ready to run for President, but the fact that she wanted to list a few talking points is not one of them. Sometimes, in preparing for class, I'll write down four topics. It's not because I can't remember them or don't understand them. It's a way to remind myself that this is what I want to emphasize and to avoid getting carried off message. Maybe I'll look at them in the course of a class. Most often, I won't. But writing them down somehow - or at least I believe - makes it less likely that I'll forget something.
These four points - believe me - are not going to be profound. They'll be pretty general. They are really cues for whatever spiel I have that lies behind them.
So, really, the point is not what was on her palm, but what she had to say.