"Parallax scrolling. A design technique that has become increasingly popular lately — and not without reason. We’ve been talking a lot about how the web has changed and how our expectations towards a website have risen. The web user of today wants to get entertained and involved. We are more than willing to engage with a website, if we are invited to do so anyway. With parallax scrolling you can do a bunch of great things to invite your visitors to engage with your site."

I hadn't heard of parallax scrolling before. Cool.