Hey everyone,
The reason that apple calls this "Natural" scolling is because it is natural. Take a sheet of paper and put it on you desk (yes, a real sheet of paper, not a virtual one and a real desk!). Now try to move the paper and up and down against that surface. You'll find that you have to move your fingers up to move the sheet up so that you can read futher down the sheet. This is Natural and this is the thinking behind the iOS and the new "Natural Scrolling" that Apple has enabled.
It drove me nuts but once I realized what Apple was doing, it quite frankly does make more sense. It took me about a month and now I wont' go back. I use the regularl scrolling at work on PC's and now I can transition without even thinking about it.
Basically think about it like you are moving the paper that the text is on and NOT the text itself (Or Web page). Then this type of scrolling will seem natural to you.
Conversly with traiditional scrolling you are moving the text up and now and not the paper behind it.