Touch Usability points to a nice Don Norman post about new gesture scrolling differences primarily instigated by Apple. As a side note, i’ve fully converted to the “content moves” model (at home, work, laptop) and did not find the transition unusual at all. As Norman notes, it just required a subtle mental shift in my model:
Both models are correct in the sense that both make logical sense. The “correct” answer is that the method of scrolling should match the user’s conceptual model of the activity (usually called the user’s mental model). Whichever method is adopted then requires that all people learn to see the world through that particular conceptual model.
It helps that I use all Macs (with Magic Trackpads and Magic Mice). When I move to a PC, the switch back to “old world” scrolling is almost effortless after a quick re-orientation.