The developers of the Webkit HTML rendering engine (the one that is used in the Apple Safari Browser) have added 3D styles to CSS. It allows layers to be rotated, scaled and moved in a 3D space.
You need to download a nightly build of the browser to see it working.
There are quite a number of applications for this I can think of. I wonder if this approach will be adopted by the W3C for a new CSS standard.