Hey jon davis, chill out. I'm sure she did a search first just so she would avoid douchebag responses such as yours.
Anyway, I wrote a letter of intent to my top choice after I was placed on the alternate list (still hoping to get accepted). You don't have to just write to your top choice. If you do write to your top choice, you can make a stronger statement like "I will definitely attend if accepted." But if you're writing to a group of top choices, then you can't make a similar commitment. I'd probably just write "blank med school is one of my top choices."
As for other content, I just wrote why it was my top choice listing some specific reasons.
Unless you're waitlisted, I don't think a letter of intent is that necessary. Good luck to you.