MacRumors.com – Dozens of Apple patent applications were published revealing research that Apple had done in 2007 on many topics encompassing future versions of Mac OS X. The most intriguing is a series of patent applications which describe a “Multidimensional” user interface. Apple has essentially been working on true 3D desktop environments.
More details at MacRumors.com
Also check out:
Spatial operating environment – http://oblong.com/