[danpker]

Make sure you move your mouse over the image.

[dfischer]

Woah. How do you do it? Magic?

[pjscott]

Looks like parallax scrolling, like we saw in some old side-scroller games:

http://en.wikipedia.org/wiki/Parallax_scrolling

[fung]

http://webdev.stephband.info/jparallax/

[Mithrandir]

Javascript.

[judofyr]

Magic. Got it.

[Groxx]

Black magic.