Edit: parallax/tacky, call it what you wish. I was thinking of this while writing the comment: http://prinzhorn.github.com/skrollr/ (note: every great thing can be ruined my misuse, I like that library.)
I can only imagine that this website was designed by someone using a Macbook (or Magic Trackpad), without realising that not everyone can scroll easily with two fingers, which is extremely short sighted.
I have a MBP myself, and I actually enjoyed scrolling through the site, but when I tested it on my Windows PC the animation was jerky and I had to scroll more than I would've liked, overall unenjoyable. I would've closed the page half way through reading and never looked back.
Yes, Mac's are awesome, but web designers need to remember that they're not designing for themselves, they're designing to every conceivable person in their target market.
Scrolling like this is great, but only in short bursts (Unless you're on a Mac w/ trackpad).
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
Very low FPS, jerky, and I have to repeatedly stress out my index finger spinning the scroll wheel.