>>>Sun Looking glass project seems cool No?
>>>http://wwws.sun.com/software/looking_glass/demo.html
[snip]
>This is really 'cool', but I dont know if this kind of desktop can bring a better productivity or really help novices to take on on computers. If novice have problems to catch how to use a mouse in a flat 2d world, how they will be able to handle this 3d world?

Hi, Gérald.

You have it in Windows. Take a look at this:
http://www.3dna.net/

Enjoy,