Apple Users

If I remember correctly, they introduce a concept called "natural scrolling" to mimic the iPhone's, iPad;s, and track pad;s scrolling method.

The metaphor previously is that windows were a viewport into content, and the scrolling action (and scroll arrows) were used to move the viewport. Clicking the top arrow would move the viewport up (and scroll content down), and clicking the bottom arrow would scroll content up.

Since the iPhone and iPad, Apple changed the metaphor to pushing the content itself up or down... It reads, counterintuitively, but scrolling up pushes the content up and actually scroll the viewport down. It's definitely a big concept change, but it really does feel much more intuitive to me especially when using a track pad.

Not sure how I feel about killing iTunes. I think I'll miss it for sentimental reason... Just as long as they keep my iTunes Match stuff.