Also, that mac must really be awesome because I don't get any parallax scrolling on windows or linux.
The parent post made a comment about not having two finger swipe. The comment I replied to asked about the scroll wheel on his mouse, which assumes he has one. I replied that most people are on laptops; laptops do not require mice, so it's not a given that he has a mouse at all. Saying most people are on laptops is not the same as saying nobody has a mouse.
However the animation and rendering is just very slow for me on Chrome + quad, about 5-10 FPS. I won't even try on Android.
This could have been greatly improved by using CSS3 animations, there's even a drop-in jquery library that makes this an easy fix: http://ricostacruz.com/jquery.transit/
With that said, the effect is overused and tacky. Message could have been delivered more quickly and elegantly.
I felt as if visiting that link was just a waste of time, like watching an old movie I've seen and looking for changes in subtitles.
I started using a few parallax plugins, then looked at the great http://johnpolacek.github.com/superscrollorama/ but finally ended up doing my own sauce.
Next time, I'll use your link