Thanks to you guys. I thought perhaps this wasn't unusual and something I should know that is out there.

Well, I'll have them check fluid levels, pumps, and so on. The car is nearing, as I said, the end of the warranty and they can look at it and see if it's normal and if anything else is out of line I should know about. It's not a horrible noise but it's worse some times than others and it's not really cute in a quirky way. My moonroof rattles slightly when you go over bumps, but rattles are sexy. Screeches are not.